perfetto: fix compile on CI debug

The libstdc++ bundled in buster-backports really does not seem to get
along with the system clang-8 used on debug bots. Fix the issue by
instead using libc++ on the bot (which we newly install).

libstdc++ is still covered by the GCC bot: the clang + libstdc++
combo wasn't covered anyway before aosp/2281848 landed.

Change-Id: I6f9d752f38cdbdec06b89ce59809afce9b41647d
diff --git a/gn/standalone/BUILD.gn b/gn/standalone/BUILD.gn
index 52da358..0d17328 100644
--- a/gn/standalone/BUILD.gn
+++ b/gn/standalone/BUILD.gn
@@ -237,6 +237,11 @@
     not_needed([ "hermetic_clang_suppressions" ])
   }
 
+  if (is_clang && !is_hermetic_clang && !is_wasm) {
+    cflags_cc += [ "-stdlib=" + non_hermetic_clang_stdlib ]
+    ldflags += [ "-stdlib=" + non_hermetic_clang_stdlib ]
+  }
+
   if (is_lto) {
     cflags += [ "-flto=full" ]
     ldflags += [ "-flto=full" ]