refs #5127 ignore warnings generated by compiling jemalloc source

git-svn-id: file:///svn/toku/tokudb@50691 c7de825b-a66e-492c-adef-691d508d4ae1

CTestCustom.cmake

@@ -223,6 +223,8 @@ list(APPEND CTEST_CUSTOM_WARNING_EXCEPTION
   "xz-4.999.9beta/src/liblzma"
   # don't complain about clang missing warnings from xz code
   "clang: warning: unknown warning option"
+  # don't complain about warnings in jemalloc source
+  "jemalloc-3.2.0/src"
   # don't complain about ranlib on empty archive
   "ranlib:"
   )