1.21.1

support exceptions with virtual inheritance, by letting libcxxabi adj…

…ust the pointer as an out param; fixes emscripten-core#2531; 1.21.9

use libcxxabi can_catch to check whether to catch an exception, and r…

…emove type info hacks; 1.21.8

do not link in libcxxabi demangle support just for default_terminate_…

…handler; 1.21.7

remove no longer needed bad_exception hack; fixes emscripten-core#2560;…

… 1.21.6

build enough of libcxxabi to support bad_typeid without undefined sym…

…bols; 1.21.5; fixes emscripten-core#2547

strsignal; 1.21.4; fixes emscripten-core#2532

build libcxxabi exception.cpp; 1.21.3