package/mesa3d: Update fminf/fmaxf patch

mesa3d now ships with a pre-generated file nir_constant_expressions.c, so there
is no need to patch nir_constant_expressions.py anymore. Furthermore the
previous patch of .py forced a re-generation of the .c file during the build,
but due to missing python-mako (removed during 10.5.3 bump) this will fail.

Fixes
http://autobuild.buildroot.net/results/35f/35fc6608b1d984587abb86700a51bf763770c795/
http://autobuild.buildroot.net/results/25b/25b43a1898d5f3b4e87efc3147b33972668aa52f/



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>