[cpp] Suppress -Wstrict-prototypes

Bug: 56256
Change-Id: I95f9b9eed7ceb1007b49892fd218e4cabb4eb221
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/processor-trace/+/600884
Reviewed-by: Tamir Duberstein <tamird@google.com>
diff --git a/libipt/BUILD.gn b/libipt/BUILD.gn
index 8c15f6f..e5f2dc2 100644
--- a/libipt/BUILD.gn
+++ b/libipt/BUILD.gn
@@ -106,4 +106,6 @@
   ]
 
   public_configs = [ ":libipt_config" ]
+
+  cflags = [ "-Wno-strict-prototypes" ]
 }