For patch #49 Add Haiku platform support

Adpated from patch, infrastructure for Haiku OS support, not yet complete.
For GLEW Patch #43 - const correctness with the OGL 4.4 specs
For GLEW Patch #42 - Patch for _CRT_SECURE_NO_WARNINGS
For GLEW Bug #233 - GL_KHR_debug: GLDEBUGPROC incorrectly defined
Updated copyright notice to mention 2008-2013 maintainership.
Fixup typos for Ubuntu build dependencies.
Ubuntu also needs libgl-dev and dos2unix
It appears that upstream are preferring void over GLvoid.
Add new snapshot links.
Fixup: glewinfo on Mac needs to call RegalMakeCurrent with the appropriate context.
Fixup: Slence mac cglang build warning about unused parameter.
Use glGetProcAddressREGAL for GLEW_REGAL purposes.
GLEW_REGAL touch-ups for using glGetProcAddressREGAL.
Windows fixup for glGetProcAddressREGAL
For GLEW Bug #242 - glVertexArrayVertexAttribDivisorEXT missing
Document recommended Fedora packages too.
For GLEW Bug #227 - Use GLAPIENTRY for GLDEBUGPROC* and leave GLAPIENTRY for application code to use.
For GLEW Bug 201 - Resolve Visual Studio 2012 resource compiler problem.
GLEW Patch #63 - Use CC/CXX/LD variable from environment, don't hardcode cc
GLEW Patch #62 - stop linking to unneeded Xmu, Xi, Xext libraries