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Bring back memfd.

--- a/support/syscall-gen/specials+linux-x64.frag

+++ b/support/syscall-gen/specials+linux-x64.frag

@@ -1,3 +1,6 @@

+/* syscalls that aren't in freebsd's syscalls.master */

+const Sysmemfd_create           : scno = 319

+

 /* getting to the os */

 extern const syscall	: (sc:scno, args:... -> int64)

 extern const sigreturn	: (-> void)

@@ -49,6 +52,7 @@

 const sendmsg	: (fd:fd, msg:msghdr#, flags:msgflags -> int64)

 const recvmsg	: (fd:fd, msg:msghdr#, flags:msgflags -> int64)

 const fallocate : (fd:fd, mode:fallocmode, off:off, len:off -> int64)

+const memfdcreate       : (name:byte[:], flags:mfdflags -> fd)

 /* signals */

 const sigaction	: (sig : signo, act : sigaction#, oact : sigaction# -> int)

@@ -186,6 +190,7 @@

 const sendmsg	= {fd, msg, flags;	-> syscall(Syssendmsg, a(fd), msg, a(flags))}

 const recvmsg	= {fd, msg, flags;	-> syscall(Sysrecvmsg, a(fd), msg, a(flags))}

 const fallocate	= {fd, mode, off, len;	-> syscall(Sysfallocate, a(fd), a(mode),  a(off), a(len))}

+const memfdcreate      = {name, flags; -> (syscall(Sysmemfd_create, cstring(name), a(flags)) : fd)}

 /* file stuff */

 const pipe	= {fds;	-> syscall(Syspipe, a(fds))}