[fusl] Remove socketcall abstraction

fusl/src/network/socket.c

 #include <sys/socket.h>
 #include <fcntl.h>
 #include <errno.h>
 #include "syscall.h"
 
 int socket(int domain, int type, int protocol) {
-  int s = socketcall(socket, domain, type, protocol, 0, 0, 0);
+  int s = syscall(SYS_socket, domain, type, protocol, 0, 0, 0);
   if (s < 0 && (errno == EINVAL || errno == EPROTONOSUPPORT) &&
       (type & (SOCK_CLOEXEC | SOCK_NONBLOCK))) {
-    s = socketcall(socket, domain, type & ~(SOCK_CLOEXEC | SOCK_NONBLOCK),
-                   protocol, 0, 0, 0);
+    s = syscall(SYS_socket, domain, type & ~(SOCK_CLOEXEC | SOCK_NONBLOCK),
+                protocol, 0, 0, 0);
     if (s < 0)
       return s;
     if (type & SOCK_CLOEXEC)
       __syscall(SYS_fcntl, s, F_SETFD, FD_CLOEXEC);
     if (type & SOCK_NONBLOCK)
       __syscall(SYS_fcntl, s, F_SETFL, O_NONBLOCK);
   }
   return s;
 }