cmake: fix this if when MPI_C_LIBRARIES is made of a list of several...

cmake: fix this if when MPI_C_LIBRARIES is made of a list of several libraries. This fixes cmake with nmad/madmpi.

cmake_modules/ChameleonPkgConfig.cmake

@@ -109,13 +109,13 @@ macro(chameleon_generate_pkgconfig_files)
   )
 
   if(CHAMELEON_USE_MPI)
-    if(${MPI_C_LIBRARIES} MATCHES "mpich")
+    if("${MPI_C_LIBRARIES}" MATCHES "mpich")
       set(MPI_NAME "mpich")
-    elseif(${MPI_C_LIBRARIES} MATCHES "mvapich2")
+    elseif("${MPI_C_LIBRARIES}" MATCHES "mvapich2")
       set(MPI_NAME "mvapich2")
-    elseif(${MPI_C_LIBRARIES} MATCHES "madmpi" OR ${MPI_C_LIBRARIES} MATCHES "nmad")
+    elseif("${MPI_C_LIBRARIES}" MATCHES "madmpi" OR "${MPI_C_LIBRARIES}" MATCHES "nmad")
       set(MPI_NAME "nmad")
-    elseif(${MPI_C_LIBRARIES} MATCHES "openmpi")
+    elseif("${MPI_C_LIBRARIES}" MATCHES "openmpi")
       set(MPI_NAME "ompi")
     else()
       set(MPI_NAME "mpi")