Add libc++ as static library

This is for the test to run without packaging libc++.so in vts-core
suite.

Bug: 147249791
Test: atest FastbootVerifyUserspaceTest
Change-Id: I0263d13a2dd08186502b30b2fad25d4f0f3a6be8
diff --git a/fastboot/fuzzy_fastboot/Android.bp b/fastboot/fuzzy_fastboot/Android.bp
index 19b33e4..d48cfa9 100644
--- a/fastboot/fuzzy_fastboot/Android.bp
+++ b/fastboot/fuzzy_fastboot/Android.bp
@@ -31,6 +31,8 @@
     "libext4_utils",
   ],
 
+  stl: "libc++_static",
+
   // Static libs (libfastboot2) shared library dependencies are not transitively included
   // This is needed to avoid link time errors when building for mac
   target: {