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Add memfdcreate for linux-x64

--- a/lib/sys/sys+linux-x64.myr

+++ b/lib/sys/sys+linux-x64.myr

@@ -35,6 +35,8 @@

 	type fallocmode	= uint32

+	type mfdflags	= uint32

+

 	type clock = union

 		`Clockrealtime

 		`Clockmonotonic

@@ -433,6 +435,10 @@

 	const Falloczerorange		: fallocmode = 0x10

 	const Fallocinsertrange		: fallocmode = 0x20

+	/* memfd flags */

+	const Mfdcloexec	: mfdflags = 0x01

+	const Mfdallowsealing	: mfdflags = 0x02

+

 	/* syscalls */

 	const Sysread			: scno = 0

 	const Syswrite			: scno = 1

@@ -817,6 +823,7 @@

 	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)

@@ -950,6 +957,7 @@

 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))}