fixed: saving/changing/restoring CMAKE_FIND_LIBRARY_SUFFIXES variable.
fixed: BLA_VENDORs "Apple" (Accelerate Framework) and
      "NAS" (vecLib Framework) fail as 'cblas_dgemm_' doesn't exist.
fixed: improve "Generic" detection on Ubuntu (and I assume Debian)
      (work with libblas3gf and liblapack3gf packages).