Bug 785440 - Disable warning C4324 when building security/certverifier. r=keeler

This warning is triggered by the use of alignas() in js/public/RootingAPI.h.
Now that GeckoProfiler.h includes RootingAPI.h, this warning is encountered
when building security/certverifier because GeckoProfiler.h is already being
included transitively, through this inclusion path:
CertVerifier.cpp -> CertVerifier.h -> Telemetry.h -> StartupTimeline.h -> GeckoProfiler.h

However, this explanation is not entirely satisfactory, because there seems to
be an existing inclusion path for RootingAPI.h already:
CertVerifier.cpp -> CertVerifier.h -> BasePrincipal.h -> OriginAttributes.h
 -> ChromeUtils.h -> ChromeUtilsBinding.h -> RootingAPI.h

So I'm not quite sure why this problem is only starting to happen now.

MozReview-Commit-ID: AFuXpTjdPsi

--HG--
extra : rebase_source : 60f74c8655d15fbc6acbf0ce8a2f208e198e231e

security/certverifier/moz.build

@@ -66,6 +66,7 @@ CXXFLAGS += ['-Wall']
 if CONFIG['CC_TYPE'] in ('msvc', 'clang-cl'):
     # -Wall with Visual C++ enables too many problematic warnings
     CXXFLAGS += [
+        '-wd4324', # structure was padded due to __declspec(align())
         '-wd4355', # 'this' used in base member initializer list
         '-wd4464', # relative include path contains '..'
         '-wd4480', # nonstandard extension used: specifying underlying type for