Merge pull request #1517 from Kangz/mac_complete_lib

BUILD.gn: only use complete_static_lib on mac
diff --git a/BUILD.gn b/BUILD.gn
index 91bb4bb..8f8e81f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -157,7 +157,11 @@
   deps = [
     ":glslang_sources",
   ]
-  complete_static_lib = true
+
+  # Without this the macOS linker complains that the static library is empty
+  if (is_mac) {
+    complete_static_lib = true
+  }
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]