librt: convince spawn to compile for !LFS

Great to have this valuable family of high kwalitee functions in here.

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

librt/spawn_int.h

@@ -24,3 +24,12 @@ struct __spawn_action {
 };
 
 int __posix_spawn_file_actions_realloc(posix_spawn_file_actions_t *fa);
+
+/* handle !LFS */
+#ifndef __UCLIBC_HAS_LFS__
+# define rlimit64 rlimit
+# define getrlimit64 getrlimit
+#endif
+#ifndef O_LARGEFILE
+# define O_LARGEFILE 0
+#endif