[Wconversion] Suppress warnings

Bug: 58162
Change-Id: Ibf37a16aeebf1530b0bedab92c36768784598363
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/github.com/ARM-software/HWCPipe/+/425962
Reviewed-by: Roland McGrath <mcgrathr@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 8a099cf..12d78e4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -31,4 +31,7 @@
     "//src/graphics/lib/magma/src/libmagma",
     "//zircon/public/lib/zx",
   ]
+
+  # TODO(fxb/58162): delete the below and fix compiler warnings
+  configs += [ "//build/config:Wno-conversion" ]
 }