filesystem_config: Allow executables in /system/libexec

Files in $PREFIX/libexec, such as gcc's cc1, need to be executable.
Don't let make_ext4fs strip executable permissions from them.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
diff --git a/include/private/android_filesystem_config.h b/include/private/android_filesystem_config.h
index 5d363a7..cc7466e 100644
--- a/include/private/android_filesystem_config.h
+++ b/include/private/android_filesystem_config.h
@@ -234,6 +234,7 @@
 
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/*" },
     { 00755, AID_ROOT,      AID_ROOT,      0, "system/lib/valgrind/*" },
+    { 00755, AID_ROOT,      AID_ROOT,      0, "system/libexec/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/xbin/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/vendor/bin/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "vendor/bin/*" },