Process: Suppress IBM XL warning about infinite loop in test

IBM XL complains:

 1500-010: (W) WARNING in test6: Infinite loop.  Program may not stop.

Tell it to ignore this because the test does it intentionally.

Change-Id: Ic99ed35067e8ddecea289fffe20d5e119029fa0f

CMakeLists.txt

@@ -1225,6 +1225,9 @@ IF(KWSYS_STANDALONE OR CMake_SOURCE_DIR)
     # Some Apple compilers produce bad optimizations in this source.
     IF(APPLE AND "${CMAKE_C_COMPILER_ID}" MATCHES "^(GNU|LLVM)$")
       SET_SOURCE_FILES_PROPERTIES(testProcess.c PROPERTIES COMPILE_FLAGS -O0)
+    ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "XL")
+      # Tell IBM XL not to warn about our test infinite loop
+      SET_PROPERTY(SOURCE testProcess.c PROPERTY COMPILE_FLAGS -qsuppress=1500-010)
     ENDIF()
 
     # Test SharedForward