Suppress warning 4577 (noexcept used with no exception handling mechanism specified)

Fixes build errors with latest ANGLE, should allow roll to land.

Bug: skia:
Change-Id: I44c7b2ed8bf3a8dbfa70a16aed51c45f2c7d5b71
Reviewed-on: https://skia-review.googlesource.com/70461
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

third_party/angle2/BUILD.gn

@@ -60,6 +60,9 @@ config("common") {
       "GL_APICALL=",
       "EGLAPI=",
     ]
+
+    # Allow noexcept, even though we build without exceptions
+    cflags_cc += [ "/wd4577" ]
   }
 }