Add module-dir flag for Compaq Visual Fortran (#11248)

This compiler uses "-module:" to specify where modules should be placed.

Modules/Platform/Windows-df.cmake

@@ -10,6 +10,8 @@ ELSE(CMAKE_VERBOSE_MAKEFILE)
   SET(CMAKE_CL_NOLOGO "/nologo")
 ENDIF(CMAKE_VERBOSE_MAKEFILE)
 
+SET(CMAKE_Fortran_MODDIR_FLAG "-module:")
+
 SET(CMAKE_Fortran_CREATE_SHARED_LIBRARY
  "link ${CMAKE_CL_NOLOGO} ${CMAKE_START_TEMP_FILE}  /out:<TARGET> /dll  <LINK_FLAGS> <OBJECTS> <LINK_LIBRARIES> ${CMAKE_END_TEMP_FILE}")