graphics/mesa-devel: temporarily drop powerpc64le fix

===>  Patching for mesa-devel-25.1.b.26
===>  Applying distribution patches for mesa-devel-25.1.b.26
1 out of 1 hunks failed--saving rejects to meson.build.rej
===>  FAILED Applying distribution patch 11aaf934112c.patch with -p1
*** Error code 1