nv50/ra: `isinf()` is in namespace `std` since C++11.

This fixes a compile error while building Nouveau with C++11 enabled (and
glibc >= 2.23). This happens if SWR is enabled, as it forces C++11.

Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Jose Fonseca <jfonseca@vmware.com>

https://bugs.freedesktop.org/show_bug.cgi?id=94907
1 file changed