CTestCustom: Suppress LNK4089 warning about SHELL32

Add a warning suppression regex to match:

 LINK : warning LNK4089: all references to 'SHELL32.DLL' discarded by /OPT:REF

Author: bradking

CTestCustom.cmake.in

@@ -32,6 +32,7 @@ set(CTEST_CUSTOM_WARNING_EXCEPTION
   "warning .980: wrong number of actual arguments to intrinsic function .std::basic_"
   "LINK : warning LNK4089: all references to.*ADVAPI32.dll.*discarded by /OPT:REF"
   "LINK : warning LNK4089: all references to.*PSAPI.DLL.*discarded by /OPT:REF"
+  "LINK : warning LNK4089: all references to.*SHELL32.dll.*discarded by /OPT:REF"
   "LINK : warning LNK4089: all references to.*USER32.dll.*discarded by /OPT:REF"
   "Warning: library was too large for page size.*"
   "Warning: public.*_archive_.*in module.*archive_*clashes with prior module.*archive_.*"