Fix fips to work even without the GL_AMD_performance_monitor extension.

Fix fips to work even without the GL_AMD_performance_monitor extension.

Even without the extension, we can still do timer queries and print
the time spent in each operation. So detect that the extension is
available, and then use that information to avoid calling into any
functions that are only made available with that extension.

The first report generated with a context that does not have the
extension will include a warning that the extension was not available.