CTestCustom: Suppress HP-UX preprocessor concatenation warning

The HP compiler on HP-UX 11.11 warns:

 Warning (anachronism) 823: ".../test_INT_format.h", line 194 # Redundant
 preprocessing concatenation operation results in two valid preprocessing
 tokens. Depending on this implementation defined behavior will result in
 non-portable code.
       TEST_C(INT32_C, -0x55000000, i32, int32_t, uint32_t)
       ^^^^^^
 Warning (anachronism) 823: ".../test_INT_format.h", line 196 # Redundant
 preprocessing concatenation operation results in two valid preprocessing
 tokens. Depending on this implementation defined behavior will result in
 non-portable code.
       TEST_C(INT64_C, -0x5500000000000000, i64, int64_t, uint64_t)
       ^^^^^^

There is likely a subtle problem with the way one of the system-provided type
macros is defined but the test passes despite the warning.  Simply suppress it.

CTestCustom.cmake.in

@@ -37,6 +37,7 @@ set(CTEST_CUSTOM_WARNING_EXCEPTION
   "LINK : warning LNK4089: all references to.*SHELL32.dll.*discarded by /OPT:REF"
   "LINK : warning LNK4089: all references to.*USER32.dll.*discarded by /OPT:REF"
   "LINK : warning LNK4089: all references to.*ole32.dll.*discarded by /OPT:REF"
+  "Warning.*: .*/Utilities/KWIML/test/test_INT_format.h.* # Redundant preprocessing concatenation"
   "Warning: library was too large for page size.*"
   "Warning: public.*_archive_.*in module.*archive_*clashes with prior module.*archive_.*"
   "Warning: public.*BZ2_bz.*in module.*bzlib.*clashes with prior module.*bzlib.*"