ENH: make find blas work if there is no fortran compiler

Modules/FindBLAS.cmake

@@ -65,7 +65,10 @@ macro(Check_Fortran_Libraries LIBRARIES _prefix _name _flags _list)
     # Test this combination of libraries.
     set(CMAKE_REQUIRED_LIBRARIES ${_flags} ${${LIBRARIES}})
     #message("DEBUG: CMAKE_REQUIRED_LIBRARIES = ${CMAKE_REQUIRED_LIBRARIES}")
-    check_fortran_function_exists(${_name} ${_prefix}${_combined_name}_WORKS)
+    get_property(_LANGUAGES_ GLOBAL PROPERTY ENABLED_LANGUAGES)
+    if(_LANGUAGES_ MATCHES Fortran)
+      check_fortran_function_exists(${_name} ${_prefix}${_combined_name}_WORKS)
+    endif(_LANGUAGES_ MATCHES Fortran)
     set(CMAKE_REQUIRED_LIBRARIES)
     mark_as_advanced(${_prefix}${_combined_name}_WORKS)
     set(_libraries_work ${${_prefix}${_combined_name}_WORKS})