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Add ncpu for 9front.

--- a/lib/thread/bld.sub

+++ b/lib/thread/bld.sub

@@ -25,6 +25,7 @@

 	#condvar+plan9.myr

 	mutex+plan9.myr

 	spawn+plan9.myr

+	ncpu+plan9.myr

 	atomic-impl+plan9-x64.s

 	# openbsd impl of thread primitives

--- /dev/null

+++ b/lib/thread/ncpu+plan9.myr

@@ -1,0 +1,12 @@

+use std

+

+pkg thread =

+	const ncpu	: (-> int)

+;;

+

+const ncpu = {

+	match std.intparse(std.getenvv("NPROC", ""))

+	| `std.Some n:	-> n

+	| `std.None:	-> 1

+	;;

+}