LibC: Define MAXPATHLEN in sys/param.h

This file is not POSIX, but some software seems to rely on it

userspace/libraries/LibC/include/sys/param.h

@@ -0,0 +1,14 @@
+#ifndef _SYS_PARAM_H
+#define _SYS_PARAM_H 1
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#include <limits.h>
+
+#define MAXPATHLEN PATH_MAX
+
+__END_DECLS
+
+#endif