Statically link libc++ into aapt2

Bug: 121280559
Change-Id: Ide6513d5cf51b832ad2c4a15676db050856728df
Test: ldd aapt2 and manual testing
diff --git a/tools/aapt2/Android.bp b/tools/aapt2/Android.bp
index c42a888..0580df6 100644
--- a/tools/aapt2/Android.bp
+++ b/tools/aapt2/Android.bp
@@ -58,6 +58,7 @@
         "libprotobuf-cpp-lite",
         "libz",
     ],
+    stl: "libc++_static",
     group_static_libs: true,
 }