www-client/chromium: add 127.0.6533.26

This release brings some major changes to the way that Chromium
is packaged in Gentoo. After masking GCC support since it broke beyond
the capabilities of the maintainers to fix in 120, changes
in 127 have made dependencies on LLVM stronger: in addition to
requiring LLVM for Rust we now directly depend on LLVM libraries for
bindgen.

As a result we're experimenting with completely dropping GCC support
from the ebuild. This isn't a decision that was made lightly, however
the advantages to going down this path make it very appealing:

- Our builds are closer to upstream (and nominally supportable)
- We don't need to maintain so many out-of-tree patches
  + We may actually be able to drop them entirely for most arches
- Ebuild logic is significantly simplified, making it easier to review
- Decreased maintainer hair-pulling.

The removed GCC support could be revisited if there is sufficient
interest, and as an added benefit the new, streamlined, and better
documented ebuild should provide a better basis for maintaining it.

One of the outcomes of this decision to double-down on LLVM support has
been the opportunity to properly select an implementation via upgrading
to the `llvm-r1` eclass, which also enables us to start trying to make
the Rust->LLVM dependency a bit more clear for our ebuild.

Notable changes:

- `llvm-r1` eclass
- Dropped GCC support
- Always bundled libcxx for stdlib
- GN/bindgen wrapper updated to work with system bindgen
  + needs upstreaming

Signed-off-by: Matt Jolly <[email protected]>

www-client/chromium/Manifest

@@ -3,7 +3,11 @@ DIST chromium-126-rust.tar.xz 150643432 BLAKE2B d9c827008a2fae07977628beccdf3cf4
 DIST chromium-126.0.6478.114.tar.xz 4167281776 BLAKE2B 4ca720b0280dc6f0aafb5da5d31f97d8d55faec9ac187fc7f3e16e447d147a6912b2b8f26247503390755146e42b32458e4c71a80e6a132cc456f414454ecf53 SHA512 49ca506eb7ac52cdfb5b491bff10deec46d62686feeb3392803eecd61a570ce6c9e6c97d61c79907aaaee39b6d32a4da399c92b8078dbdf2df097f37c757d286
 DIST chromium-126.0.6478.126.tar.xz 4166142564 BLAKE2B 4c709c3a02a01f6bef46309b4a2f3d8cd688007e6b69152a5119a098c98aa272e10ea1ebf418c75387d08e1b9dde75ad53eabc12cf860b288e732c9b974e6066 SHA512 4a86edb82ec530299f8298b7604a18efb5ccf6a6cde37950d7821a73b005b9e83805a0b7f36f2fa5b4f71e237bf70ec628c1864e4f81caa4333a5dc904fb3aab
 DIST chromium-126.0.6478.57.tar.xz 4162722444 BLAKE2B cc41d74916a81a1162aad8ae785e08423ca1c4a49b7b8cdfe0873efab3b67e90da4e240c8c564c77cb67466af6d7c6a61ca3acfa8aae227838060565c0fbb3a5 SHA512 e350cf34ddc7c010e6f2d87c3f8dbaa17f5dd448b10f07b6dd319e494f7d70c6caf3ef7e676de33ee1e05d602edfbae9bcf3807887ae74c32bc49a6db7aa79a7
+DIST chromium-127-clang.tar.xz 50869256 BLAKE2B a25c78c28e1a19bb251ce78831ff8aeea51f0ff0a3fcba4f57e14e676aadba38f248554a52d9f67da8c0ccf533ef9f60b4bbb26f8935914efa2b871444e61d8f SHA512 9033c2dd7dd217917caf3dbed52f72ded18fe81b431edd4ef82fe7c592f7b9fbf6d5d2c8f7ba4ebffb4994bef20579d30aea9dd1ad36db86bec5d0adb6eca062
+DIST chromium-127-rust.tar.xz 151082700 BLAKE2B 53b5e72724425ae97bbb22e128ca5e826a2db5fb49f615c5331cdf6d790c253d58061223ff9fbd7f4deecaa19668e7b905b0a661380f48ce74d7f66a9605be18 SHA512 a47fc0bdbf48da9c8c17c91d9dc1a4a3f09578e82199c0d5843dfb6188803161cdb98d065ee3f85ceaf78efd2c233397c325c4c9f2d19255f38734a81599404b
+DIST chromium-127.0.6533.26.tar.xz 6590894364 BLAKE2B 1806ba0d75aca8c9a6d491ff14401364d5429ad5fb2c3c605d2c7694492782007e5b584bf543f59fdc7732589871bf307503c9928b2da57121b54269cd0f6c30 SHA512 4a3a08ed6b3a0ba40597c99bf520112a92d2c92171ac8f3c13356b5ce7bfd6ba91473b69d4216b23757ac2ffc267aa34d18e77d21a6bbaabfe10c674ec791ace
 DIST chromium-patches-126.tar.bz2 4538 BLAKE2B c1f224015618ec908ef09d0c04a2243923371e2caeccd60d93747599fd1434b284291a5b4326008db21749cf78827d5a4b50d22fc805dcd3c1fd86303dc82729 SHA512 6692075adac0379b5f27d1023de1a051cf7f7f7138efd32dfc3af0d501b714142a16daf18022bb46d92218587f364f4dafe9f4aea24f6826e88b0e7cc2be7d0b
+DIST chromium-patches-127.tar.bz2 4545 BLAKE2B cd0221e74a886ad3fc598e92876021b847a92a587ddc66774357ccf06bdd14e23f8bfede9bbe6fd154af8cea570bfa6ee27a2ff393883bd314a7d1326c7260f5 SHA512 938926ecd406d96662a6ed6e9fab9efab156f5691e98c044c75c4d335075f61e80eae2cf3be9b626c01d3542c1785dd0fc63ac31e5cbf1555a8eca3c6aed8c56
 DIST chromium-ppc64le-gentoo-patches-1.tar.xz 5636 BLAKE2B 1d898939df023c59285b27bee552470483ea06375d1ee8d6947b89c5927c23cc7bfec6b49f3b376ece931d11a56f8e2a45791e0f92ad61974fc8c34c1082d89c SHA512 8a71cb007e47cda8e5fe5d185729389e65c48bd322c8ee8b3986bee8571427b959628f2666bda646a3f89ae64197c0957d3626845ff03461dbd5dee4c964d07c
 DIST chromium-profiler-0.2.tar 259952640 BLAKE2B 5e82389fce00b267280d633b26551231c558b80f0c92cd7d60271095a3503365ab673e7a46dc5f74f8a82db1f21262cb24dcc0531d954bab5fb3b175dab3394d SHA512 9fa89a5ab728419683e7495ae676567480987d68a2d589f2aa97bfcbcf123f3c8f97f8bca5f65e5e3f6e41475535add473ded83b9c7a33bb4746a9d05b298a6c
 DIST chromium_124.0.6367.207-1raptor0~deb12u1.debian.tar.xz 587248 BLAKE2B 4c5a12b3e70be85b31d60d35d160281cbf8b93422169243f743fff25805bc7006ffeed5f95b415fb49e9cf4c3bf2c0a2d5ed10642d8f772df24cab1fe738125a SHA512 025ac185f27c66438a5eaf482120fded42d37403706fd012fbde1b6acf5c2e360bb2fb7723183d4883f66f36afe10167a2d919cde11735186a1a87b28ffaf9c6