move automatic OES_standard_derivatives enabling behind LEGACY_GL_EMULATION define
disable other.test_chunking in fastcomp, since it's irrelevant
tool to parse unaligned output
comment on emscripten_set_main_loop fps setting
optimize out fround calls on clients that do not support fround
avoid blobs when not necessary for client code mods
add testcase for odd large doubles
allow external variables to be defined as strings in library*.js files
Always preventDefault() on keydown if keypress is not needed.

Some browser shortcut keys activate if event.preventDefault()
is not called for the keydown event. This will prevent all such
hotkeys when keypress events aren't needed.
add memcpy test
Merge pull request #2082 from inolen/oes_stdder

don't check to enable OES_standard_derivatives in GL.getSource
Add optimized versions of musl libc string and memory comparison functions.
Add strcoll as well so that library.js does not need to depend on musl libc code.
Add missing memcmp symbol declaration from previous commit.
Revert strcmp.c to musl v0.9.13 so that the versions in this pull request match the ones that waywardmonkeys has pushed in earlier.
add memset test
fuzz -O3 as well
use .set on big memcpys
Fix test_strcmp_uni and test_dlfcn_stacks after previous commit.
warn when rendering without setAnimationFrame