configure.ac: Fix "broken OpenGL setup" check

[Anderson Lizardo]

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Hi,

Here is a new patch that fixes the "broken OpenGL setup" check. It
incorporates Alexandre's suggestion
(http://www.winehq.org/hypermail/wine-devel/2005/06/0805.html) to check
for brokeness doing an actual build/linking instead of checking for
missing or present files. The error message was also rewritten so it
makes more sense.

Changelog:

Fixed "broken OpenGL setup" configure check, which used to report false
errors on some systems.

####
Testcase for Ubuntu Linux 5.04 + NVIDIA RIVA TNT2 card, starting from
"non-NVIDIA" installation (i.e. nvidia-glx* not installed):

Case #1:
# aptitude reinstall xlibmesa-gl xlibmesa-gl-dev
# aptitude install nvidia-glx nvidia-glx-dev
Result: OpenGL support detected and enabled

Case #2:
# aptitude purge nvidia-glx-dev
Result: OpenGL support detected as broken

Case #3:
# aptitude purge nvidia-glx
# aptitude reinstall xlibmesa-gl xlibmesa-gl-dev
Result: OpenGL support detected and enabled

Case #3:
# aptitude purge xlibmesa-gl-dev
Result: OpenGL support not detected

Conclusion: new check code works as expected.
####

Thanks,
- --
Anderson Lizardo
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