cleanup socketcall syscall interface to ease porting to sane(r) archs

src/network/sendmsg.c

@@ -1,14 +1,12 @@
 #include <sys/socket.h>
 #include "syscall.h"
-#include "socketcall.h"
 #include "libc.h"
 
 ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
 {
-	unsigned long args[] = { fd, (unsigned long)msg, flags };
 	ssize_t r;
 	CANCELPT_BEGIN;
-	r = syscall2(__NR_socketcall, SYS_SENDMSG, (long)args);
+	r = socketcall(sendmsg, fd, msg, flags, 0, 0, 0);
 	CANCELPT_END;
 	return r;
 }