Generate build ids.

Change-Id: I7a486d31e28c6e5d2aafa8fdd2a4c180e9d22187
diff --git a/gn/standalone/BUILD.gn b/gn/standalone/BUILD.gn
index a2ce0af..d98b656 100644
--- a/gn/standalone/BUILD.gn
+++ b/gn/standalone/BUILD.gn
@@ -88,6 +88,10 @@
   ldflags = []
   libs = []
 
+  if (is_android || is_linux || is_mac) {
+    ldflags += [ "-Wl,--build-id" ]
+  }
+
   cflags += [
     "-fstrict-aliasing",
     "-fstack-protector-strong",
@@ -179,7 +183,6 @@
       "-Wl,--exclude-libs,libunwind.a",
       "-Wl,--exclude-libs,libgcc.a",
       "-Wl,--exclude-libs,libc++_static.a",
-      "-Wl,--build-id",
       "-Wl,--no-undefined",
       "-Wl,-z,noexecstack",
       "-Wl,-z,relro",