Use libcutils_headers for android_filesystem_config.h

android_filesystem_config.h is found since system/core/include is on
the include path for all projects and contains a symlink to the real
android_filesystem_config.h.  This is fragile and the below bug seeks
to remove this symlink and have users correctly depend on
libcutils_headers.

Bug: 165825252
Test: build
Change-Id: I1aad6a2e8fbe87635e97b0ac1be3414403353382
diff --git a/run-as/Android.bp b/run-as/Android.bp
index 840a43c..accd07d 100644
--- a/run-as/Android.bp
+++ b/run-as/Android.bp
@@ -25,4 +25,5 @@
         "libpackagelistparser",
         "libminijail",
     ],
+    header_libs: ["libcutils_headers"],
 }