Changed cmake script to not try and link to gfortran when using openblas

since sometimes gfortran isn't available and openblas should already be linked
to gfortran if it was needed.

dlib/cmake_find_blas.txt

@@ -117,7 +117,7 @@ if (UNIX)
          CHECK_FUNCTION_EXISTS(sgetrf_single OPENBLAS_HAS_LAPACK)
          if (OPENBLAS_HAS_LAPACK)
             message(STATUS "Using OpenBLAS's built in LAPACK")
-            set(lapack_libraries gfortran) 
+            # set(lapack_libraries gfortran) 
             set(lapack_found 1)
          endif()
       endif()