[fusl] Remove socketcall abstraction

fusl/src/network/sendmsg.c

 #include <sys/socket.h>
 #include <limits.h>
 #include <string.h>
 #include <errno.h>
 #include "syscall.h"
 #include "libc.h"
 
 ssize_t sendmsg(int fd, const struct msghdr* msg, int flags) {
 #if LONG_MAX > INT_MAX
   struct msghdr h;
   struct cmsghdr chbuf[1024 / sizeof(struct cmsghdr) + 1], *c;
   if (msg) {
     h = *msg;
     h.__pad1 = h.__pad2 = 0;
     msg = &h;
     if (h.msg_controllen) {
       if (h.msg_controllen > 1024) {
         errno = ENOMEM;
         return -1;
       }
       memcpy(chbuf, h.msg_control, h.msg_controllen);
       h.msg_control = chbuf;
       for (c = CMSG_FIRSTHDR(&h); c; c = CMSG_NXTHDR(&h, c))
         c->__pad1 = 0;
     }
   }
 #endif
-  return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0);
+  return syscall_cp(SYS_sendmsg, fd, msg, flags, 0, 0, 0);
 }