Replaces M_PIf by M_PI in Atlas, fixes compilation with gcc 11.2.0 and glibc 2.35.
There was added a workaround in glibc to fix tests.
Refs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103735
https://sourceware.org/bugzilla/show_bug.cgi?id=28713