properly outline the while (1) switch pattern
some sdl additions
fix outlining log message
when Module.screenIsReadOnly is set, do not constantly read the SDL screen pixels
add sdl-config tool
add some cpu undefs that are important for configure steps
refactor COMPILER_OPTS
do not assume all postSets from global constants are i32
track if there is inline js, and if so do not mark as valid asm.js
Update libc headers to use musl headers.
Update to work with new libc headers.
Fix other.test_embind & other.test_static_link.
Fix time tests.
Add __va_copy as a compat/stdarg.h
Fix fpclassify with musl libc headers.

musl defines __fpclassify, __fpclassifyf, __fpclassifyl while
the old headers used __fpclassifyd for double rather than
__fpclassify.
Provide better impl of __assert_fail().
Bump version for new libc headers.
Emscripten requires different #s for stdio fds.
Handle fpclassify and signbit for long double.
Fix sockaddr struct definitions for musl.