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Add renezvous syscall to 9front.
	Oops, missed this.

--- a/lib/sys/sys+plan9-x64.myr

+++ b/lib/sys/sys+plan9-x64.myr

@@ -162,6 +162,7 @@

 	const semacquire	: (addr : uint32#, block : int -> int)

 	const tsemacquire	: (addr : uint32#, ms : uint32 -> int)

 	const semrelease	: (addr : uint32#, count : int32 -> int32)

+	const rendezvous	: (tag : void#, val : void# -> void#)

 	extern const alloca	: (sz : size	-> byte#)

@@ -259,3 +260,5 @@

 const semacquire	= {addr, block; -> (syscall(Syssemacquire, a(addr), a(block)) : int)}

 const tsemacquire	= {addr, ms; -> (syscall(Systsemacquire, a(addr), a(ms)) : int)}

 const semrelease	= {addr, count; -> (syscall(Syssemrelease, a(addr), a(count)) : int32)}

+const rendezvous	= {tag, val; -> (syscall(Sysrendezvous, a(tag), a(val)) : void#)}

+