Revert "Revert "modesetting: Indirect the glamor API through LoaderSymbol""

Now that we've fixed LoaderSymbolFromModule this should work properly.

This reverts commit 5c7c6d5c.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
3 jobs for modesetting-glamor-dlsym in 4 minutes and 15 seconds (queued for 1 second)
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autotools-build-and-test

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passed #997718
meson-build-and-test

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