squid: drop musl compat patch

Signed-off-by: Luka Perkov <luka@openwrt.org>

net/squid/patches/200-musl-compat.patch

@@ -1,15 +0,0 @@
---- a/lib/rfcnb/rfcnb-io.c
-+++ b/lib/rfcnb/rfcnb-io.c
-@@ -36,11 +36,11 @@
- #include "rfcnb/rfcnb-util.h"
- #include "rfcnb/std-includes.h"
- 
-+#include <signal.h>
- #if HAVE_STRING_H
- #include <string.h>
- #endif
- #include <sys/uio.h>
--#include <sys/signal.h>
- 
- int RFCNB_Timeout = 0;          /* Timeout in seconds ... */
-