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mesa built with -O3 on ppc64el fails mutter/libepoxy tests: "libEGL warning: DRI2: failed to create any config"

If mesa is built with -O3 on ppc64el, the tests on mutter/libepoxy fail:

Running test: mutter-8/mutter-all.test
# random seed: R02Se516dbe7d59483b5654bf34b122c63fc
# GLib-GIO-DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ?gio-vfs?
# GLib-GIO-DEBUG: _g_io_module_get_default: Found default implementation memory (GMemorySettingsBackend) for
?gsettings-backend?
libEGL warning: DRI2: failed to create any config
libEGL warning: DRI2: failed to create any config
libEGL warning: DRI2: failed to create any config
libEGL warning: DRI2: failed to create any config
Bail out! Clutter-FATAL-CRITICAL: Unable to initialize Clutter: Unable to initialize the Clutter backend: no
available drivers found.

I suspect 08781845 might have something to do with it, but haven't tested reverting that.

Edited by Timo Aaltonen
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