FindMPI: do not detect `-framework` as a compile flag
MPICH 3.4.2 now reports
-framework OpenCL as one of its compilation
flag. The compile flag extraction is seeing it as a generic
and misses its argument. This ends up with a compile option of
-framework which eats the next flag (and may be very important).
It does not seem that passing
-framework as a link flag is necessary
at this time, so that is being actively ignored for now.
Fixes: #22555 (closed)