New features:
* Licensing change (BSD, Mesa 3-D, Khronos)
* Switch to using registry on www.opengl.org
* Support for major and minor version strings
New extensions:
* GL_APPLE_flush_buffer_range
* GL_GREMEDY_frame_terminator
* GLX_EXT_texture_from_pixmap
Bug fixes:
* Incorrent 64-bit type definitions
* Do not strip static library on install
* Missing tokens in GL_ATI_fragment_shader and WGL_{ARB,EXT}_make_current_read
* Missing tokens in GL_VERSION_2_1
* Missing functions in GL_VERSION_1_4
* Incorrect parameter type for glXCopyContext
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.
The OpenGL Extension Wrangler Library (GLEW) is a cross-platform
C/C++ extension loading library. GLEW provides efficient run-time
mechanisms for determining which OpenGL extensions are supported
on the target platform. OpenGL core and extension functionality is
exposed in a single header file.
