Bug 992503 - Remove the MSVC exemption for FAIL_ON_WARNINGS in tools/profiler. r=BenWa

tools/profiler/moz.build

@@ -5,7 +5,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 if CONFIG['MOZ_ENABLE_PROFILER_SPS']:
-    FAIL_ON_WARNINGS = not CONFIG['_MSC_VER']
+    FAIL_ON_WARNINGS = True
 
     XPIDL_MODULE = 'profiler'
     XPIDL_SOURCES += [