package/physfs: new package

Backport a patch from SuperTux project:
https://github.com/SuperTux/physfs/commit/61d3b63abcba8e9615dcb8a3d1fc026bf7f8d5f8

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
diff --git a/package/Config.in b/package/Config.in
index 51c7264..9a78e0a 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -986,6 +986,7 @@
 	source "package/libnfs/Config.in"
 	source "package/libsysfs/Config.in"
 	source "package/lockdev/Config.in"
+	source "package/physfs/Config.in"
 endmenu
 
 menu "Graphics"