find and export parallel and fordune variables as uppercase with UG_ prefix.

UG_PARALLEL and UG_FOR_DUNE can now be checked by CMake.

[[Imported from SVN: r8524]]

ug-config.cmake.in

@@ -2,8 +2,8 @@ set(prefix @prefix@)
 set(exec_prefix @exec_prefix@)
 set(libdir @libdir@)
 set(includedir @includedir@)
-set(parallel @parallel)
-set(fordune @fordune@)
+set(UG_PARALLEL @parallel@)
+set(UG_FOR_DUNE @fordune@)
 set(UG_LIBRARIES -ldevS @UG_XLIBS@)
 set(UG_LIBRARY_FLAGS -L${libdir})
 set(UG_INCLUDES ${includedir})