Log Message:
math/lapack, math/cblas, math/lapacke: Remove premature cmake files from install

Those cmake config files are not useful for us and they are incorrect
for the upcoming 64-bit-index variants. Also, we could switch back
to the Makefile build from cmake in future. Let's treat the question of
CMake as implementation detail of the packages.

The actual use is via mk/blas.bl3 in pkgsrc and pkg-config. There isn't
even added value in these files, were they to be correct. CMake builds
can use pkg-config just fine.