cmake: Support current macports SuiteSparse 5.3.0

SuiteSparse.dylib does not exist anymore, which the finder tried to find
and link aginst.

cf. https://github.com/macports/macports-ports/commit/6e7ed75a61f22bdecdde5a9c81fce7bbded60f2c

cmake/FindSUITESPARSE.cmake

@@ -89,15 +89,15 @@ if( WIN32 )
 else( WIN32 )
    IF( APPLE)
 	   FIND_PATH( CHOLMOD_INCLUDE_DIR cholmod.h
-        	      PATHS  /opt/local/include/ufsparse )
+                  PATHS /opt/local/include
+                        /opt/local/include/ufsparse )
 
            FIND_PATH( SUITESPARSE_LIBRARY_DIR
-                      NAMES libSuiteSparse.dylib
+                      NAMES libcholmod.dylib
                       PATHS /opt/local/lib )
 
            list ( APPEND SUITESPARSE_LIBRARY_DIRS ${SUITESPARSE_LIBRARY_DIR} )
 
-           list ( APPEND SUITESPARSE_LIBRARIES SuiteSparse)
 
    ELSE(APPLE)
 	   FIND_PATH( CHOLMOD_INCLUDE_DIR cholmod.h