add tests for SDL_GetRGB and SDL_GetRGBA
clean up how PYTHON is specified.  it is not specified in .emscripten by default
Add a note to clarify requirements placed by DOM Level 3 spec on the browser resize event.
cherry-pick musl 1.1.3 wcsxfrm.c, fixes #2473
Merge pull request #2470 from sronsse/sdl

add tests for SDL_GetRGB and SDL_GetRGBA
Merge pull request #2469 from chadaustin/use-sys-executable

clean up how PYTHON is specified.  it is not specified in .emscripten by default
check return codes when building system libs
update musl from 0.9.13 to 1.0.3
update sanity.test_firstrun
fix sanity.test_emcc_caching
disable test_math_lgamma in non-fastcomp
remove obsolete 'simple' mode in emscript_fast
guard against code execution before runtime is initialized and after it is exited
move aborting check around doRun
fix typo
more comprehensive testing for runtime misuse (either before initialized or after exited)
improve assert text
emit memory initialization file by default in -O2+
fix browser.test_uuid to use the temp test dir normally
fix other.test_module_exports_with_closure