Fix tests configuration and building when only GLVND full OpenGL implementation is present #4201
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PREVIOUS ISSUE
Many of the tests in /tests wouldn't link if only the modern full OpenGL implementation (GLVND) is present on the system. This commit fixes that.
WHAT THIS COMMIT DOES
What this commit does is enable the
libOpenGL.sodetection intests/configure.ac.So if
libOpenGL.sois present test programs will be linked against-lOpenGLinstead of-lGL.-If both
libGL.soandlibOpenGL.soare present,libOpenGL.sois preferred as it's a modern and vendor-neutral implementation, vs the old and X11-boundlibGL.so-If only
libGL.sois present, libGL.so will be used.-If only
libOpenGL.sois present it will be used.