- Preprocessor variables need to be separated from string constants to be separated token
- Use ##__VA_ARGS__ GCC extension to support empry __VA_ARGS__ (should be no-op on MSVC). See:
http://www.delorie.com/gnu/docs/gcc/gcc_44.html
for details.

The following series fixes compilation on GCC (from mingw-w64) and allows cross compiling the source on Linux. It was tested in Mozilla tree since ANGLE has no support for GCC in its build system.

Issue=358
Signed-off-by: Daniel Koch

git-svn-id: https://angleproject.googlecode.com/svn/trunk@1259 736b8ea6-26fd-11df-bfd4-992fa37f6226