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And make _mesa_copy_string() non-static.

All these pointers are in the __DRIcontext struct, which we point to.

With DRI2, x and y are always zero and fb->Height is always up to date
with the drawable height.

Fixes progs/glsl/deriv.

the condition can't be false, declerations are ok even if we don't
emit any.

Conflicts:
	Makefile
	src/mesa/main/version.h

Resolved by keeping version strings from master (also in the intel driver).

Apparently the higher compiler optimization level in non-debug builds was
eliminating the unused functions referencing the unresolved DRI2 symbols...

Free the returned configs upon errors.

Remove mfeatures_es1.h and mfeatures_es2.h.  Build the overlay with
either FEATURE_ES1 or FEATURE_ES2 defined.

Add features tested in the code but missing from mfeatures.h.

This also fixes some tests of features.  They should be tested with
"#if", not "#ifdef".

Add FEATURE_GL, FEATURE_ES1, and FEATURE_ES2 for OpenGL, OpenGL ES 1.x,
and OpenGL ES 2.x respectively.  Define individual features through the
new umbrella features.  There is no real change introduced by this
commit.

Doesn't hurt, and reduces code duplication.

There are X visuals that Gallium or the code does not support.  We could
not assert the color format to be supported.  Return PIPE_FORMAT_NONE in
such cases and let the caller handle it.

fsraytrace and vsraytrace were crashing on Mac OS X 10.6.3 in the Apple
GLSL compiler function TPPStreamCompiler::assignOperands. Removing some
const qualifers made the crashes go away.

Fixes MSVC build.