Revert "Add patch to fix Linux kernel regression with mmap and `MAP_3…

…2BIT`"

This reverts commit d496154.

The Linux kernel regression has been patched in 6.1.30 and 6.3.4.

CI: Mono 6.12.0.198, Python 3.11, use ubuntu-latest

- Rediff patches against Mono 6.12.0.198.
- Drop `xcode_13_14_fix.diff` which is included upstream in 6.12.0.198.

Merge pull request #80 from bruvzg/btls_arm_macos

Add patch for ARM64 macOS BTLS build.

Merge pull request #75 from akien-mga/ci-use-linux-sdk

CI: Use our own Linux SDK to maximize glibc compatibilty

CI: Mono 6.12.0.182, Android 32 and other updates

Mono: Bump to 6.12.0.179

Mono: Bump to 6.12.0.178

Mono: Bump to 6.12.0.177

CI: Bump old ubuntu version to ubuntu-18.04

The ubuntu-16.04 runners have been removed from GitHub Actions.

Merge pull request #43 from akien-mga/mono-6.12.0.147

CI: Build with Mono 6.12.0.147