[em++]: Removed unnecessary warning about the PYTHON variable ;
Fix dependencies on DNS
[library_glut.js]: Handle DELETE & BACKSPACE correctly ;
[thirdparty/lzma.js]: Fixed doit.sh so that it compiles on Windows using MingW's GCC & Bash ;
Update libcxx to 194185, 2013-11-07.

This brings C++14 support.
Don't use atomic as that breaks our version of clang.
Bump version & regen symbols for libcxx.
Add more names for functions that show up in Firefox profiler as anonymous.
Implement GLES2 glShaderBinary and glReleaseShaderCompiler functions as no-op stubs. Add a machinery for glGetError() to report errors generated by the library_gl.js interop layer.
Add self to AUTHORS
invalidate calls on conditionals in js optimizer, to avoid eliminating into a non-executing code path
Merge pull request #1768 from juj/gles2_func_stubs

GLES2 func stubs.
no-op for __builtin_prefetch; fixes #1765
Merge pull request #1764 from juj/name_more_functions

Add more names for functions that show up in Firefox profiler as anonymous.
Merge pull request #1761 from prenaux/develop

GLUT support for DELETE & BACKSPACE keys ; Fixed lzma.js doit.sh so that it works on Windows ; Removed unnecessary warning in em++ ;
Merge branch 'master' of github.com:bobroberts177/emscripten into incoming
Merge pull request #1767 from waywardmonkeys/update-libcxx

 Update libcxx
Fix test_lua on Windows when built using mingw32-make. That tool got confused by a '#' comment at the end of a command line, so move the comment to its own separate line.
Merge pull request #1773 from juj/fix_test_lua

Fix test_lua on Windows.
Fix test_asm_pgo on Windows by using response files. The test failed by exceeding Windows command line length limitations, giving an error "WindowsError: [Error 87] The parameter is incorrect". Also extend the logging given by EM_BUILD_VERBOSE=3 to print out the compiler invokations.