Add Makefile support for gcc-4.4, gcc-4.6 and clang toolchains on Linux.
Resolve clang compilation error: lookup of 'Depth' in member access expression is ambiguous
boost::print fix for mapping 'long' and 'long long' to 32-bit or 64-bit for length purposes. (gcc 4.8)
GLEW refresh
NaCL Pepper now uses GLES2 prefix for ES2.0 functions, rather than gl
Bump codgen copyright.
NaCL-related build tweaks for regaltest, nacl example and pnacl.

Party based on nacports patch for Regal:
https://code.google.com/p/naclports/source/browse/trunk/src/ports/regal/nacl.patch

Tested with pepper_34, pepper_35 and pepper_36