Include CheckFortranSourceCompiles where it is needed.

The former version was including CheckCSourceCompiles instead of the Fortran
version.  This in principle does not matter, because CheckFortranSourceCompile
is included already.  For clarity nevertheless this should be made consistent.

Author: vehre

CMakeLists.txt

@@ -189,7 +189,7 @@ set(OLD_INCLUDES ${CMAKE_REQUIRED_INCLUDES})
 set(CMAKE_REQUIRED_INCLUDES ${MPI_Fortran_INCLUDE_PATH})
 set(OLD_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
 set(CMAKE_REQUIRED_LIBRARIES ${MPI_Fortran_LIBRARIES})
-include (CheckCSourceCompiles)
+include (CheckFortranSourceCompiles)
 CHECK_Fortran_SOURCE_COMPILES("
 program mpi_hello
 use mpi
@@ -221,7 +221,7 @@ set(OLD_INCLUDES ${CMAKE_REQUIRED_INCLUDES})
 set(CMAKE_REQUIRED_INCLUDES ${MPI_Fortran_INCLUDE_PATH})
 set(OLD_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
 set(CMAKE_REQUIRED_LIBRARIES ${MPI_Fortran_LIBRARIES})
-include (CheckCSourceCompiles)
+include (CheckFortranSourceCompiles)
 CHECK_Fortran_SOURCE_COMPILES("
 program mpi_hello
 implicit none