Reference the github page that provided the CMakeLists.txt files

Patches/SuiteSparse/Patch.cmake

@@ -8,6 +8,12 @@ if (BUILD_CXSPARSE_ONLY)
     DESTINATION ${SuiteSparse_source}/CMakeLists.txt
     )
 else()
+
+  # The following CMakeLists.txt files come from:
+  # https://github.com/jlblancoc/suitesparse-metis-for-windows. It was written for a
+  # newer version of SuiteSparse so some modification was required. Ideally, we
+  # will update our version of SuiteSparse to match the provided CMake files.
+
   # Main SuiteSparse CMakeLists.txt
   file(COPY ${SuiteSparse_patch}/CMakeLists.txt
     DESTINATION ${SuiteSparse_source}