Delete include/private/android_filesystem_config.h

This header should be accessed through libcutils.

Test: build
Change-Id: Ifb0ad3bc63ec5806d9c474a5d39721b2189c34de
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index 1f775db..b749d87 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -14,6 +14,11 @@
 // limitations under the License.
 //
 
+filegroup {
+    name: "android_filesystem_config_header",
+    srcs: ["include/private/android_filesystem_config.h"],
+}
+
 // some files must not be compiled when building against Mingw
 // they correspond to features not used by our host development tools
 // which are also hard or even impossible to port to native Win32