busybox: Remove unused patch

pkgs/os-specific/linux/busybox/include-missing-sys-resource-header.patch

@@ -1,12 +0,0 @@
-diff --git a/include/libbb.h b/include/libbb.h
-index f12800f..e7806c2 100644
---- a/include/libbb.h
-+++ b/include/libbb.h
-@@ -40,6 +40,7 @@
- #include <sys/poll.h>
- #include <sys/ioctl.h>
- #include <sys/mman.h>
-+#include <sys/resource.h>
- #include <sys/socket.h>
- #include <sys/stat.h>
- #include <sys/time.h>