fix _tmpfile to allocate mode argument correctly
Update libcxx.
Provide a value for ELAST.
Bump emscripten version.
fix for empty file bug in idbfs
Merge pull request #2844 from waywardmonkeys/update-libcxx

Update libcxx
Fix a couple of warnings.
Remove redundant comment in src/library_gl.js for roundedToNextMultipleOf() which deals with positive size values.
added implementation of utimes (with an 's') like the existing utime
fix utimes to look at modtime ([1]) instead of atime ([0])
adding myself to AUTHORS file
Merge pull request #2845 from pkholland/incoming

fix for empty file bug in idbfs
Update ChangeLog to latest.
Polyfill glMapBufferRange and glUnmapBuffer from GLES 3.
Make sure to free the mapping slot.
Update AUTHORS.
Address review comments and add glFlushMappedBufferRange.
Merge pull request #2847 from waywardmonkeys/fix-some-test-other-warnings

Fix a couple of warnings.
Follow symlinks when doing the assert check in tests other.test_argv0_node and other.test_EMCC_BUILD_DIR to fix the tests. Fixes #2846.
add James Long to AUTHORS