fixed float read performance in _scanString
Fix an issue with Boost compilation.

The issue is that when these macros are defined, libcxx
creates inline functions and so we end up with 2 separate
defintions of these functions (one inline in std and one
that is extern "C").

We undef these until libcxx is fixed. Without this,
some things can fail to compile correctly, like
Boost. Fixes issue #1716.
added myself
reuse ops objects in MEMFS.createNode
fix handling of generating path with a mountpoint ending with '/'
optimize createStream
fix progress shown when multiple asset packages are downloaded
fix glGetString and eglQueryString, and optimize emulated glGetString
Merge pull request #1740 from waywardmonkeys/boost-libcxx-libc-interaction

Fix an issue with Boost compilation.
Merge branch 'master' of github.com:icetooth/emscripten into incoming
small whitespace style fix
Added symbol for glLogicOp, but added statement that it is
unsupported.