Fix build - December 2021

Ignore extra-semi and strict-prototypes warnings.

bug: fxb/89971
Change-Id: If25e16190f22e404b769f9a8507d65b757070ffd
diff --git a/fuchsia/BUILD.gn b/fuchsia/BUILD.gn
index b6f10b4..7af2561 100644
--- a/fuchsia/BUILD.gn
+++ b/fuchsia/BUILD.gn
@@ -44,6 +44,8 @@
     "-Wno-incompatible-pointer-types",
     "-Wno-conversion",
     "-Wno-unused-but-set-variable",
+    "-Wno-strict-prototypes",
+    "-Wno-extra-semi",
   ]
 
   ldflags = [ "-Wl,-z,stack-size=0x1000000" ]