Build standalone client using static STL.

Change-Id: I487c801a7d4c0cd85502738d934ff05de02414fa
Bug: 160400319
diff --git a/tools/gen_android_bp b/tools/gen_android_bp
index 680c02e..5e61182 100755
--- a/tools/gen_android_bp
+++ b/tools/gen_android_bp
@@ -180,6 +180,7 @@
     'heapprofd_standalone_client': [
         ('static_libs', {'libasync_safe'}),
         ('version_script', 'src/profiling/memory/heapprofd_client_api.map.txt'),
+        ('stl', 'libc++_static'),
     ],
     'perfetto_unittests': [
         ('data', set(enumerate_data_deps())),