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Add support for OpenBSD's MAP_STACK mmap flags, use it in libthread

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

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

@@ -215,6 +215,7 @@

 	const Mfixed	: mopt = 0x10

 	const Mfile	: mopt = 0x0

 	const Manon	: mopt = 0x1000

+	const Mstack	: mopt = 0x4000

 	const Mnoreplace	: mopt = 0x0800

 	/* file types */

--- a/lib/sys/sys+openbsd:6.2-x64.myr

+++ b/lib/sys/sys+openbsd:6.2-x64.myr

@@ -348,6 +348,7 @@

 	const Mfixed	: mopt = 0x10

 	const Mfile	: mopt = 0x0

 	const Manon	: mopt = 0x1000

+	const Mstack	: mopt = 0x4000

 	const Mnoreplace	: mopt = 0x0800

 	/* file types */

--- a/lib/sys/sys+openbsd:6.3-x64.myr

+++ b/lib/sys/sys+openbsd:6.3-x64.myr

@@ -354,6 +354,7 @@

 	const Mfixed	: mopt = 0x10

 	const Mfile	: mopt = 0x0

 	const Manon	: mopt = 0x1000

+	const Mstack	: mopt = 0x4000

 	const Mnoreplace	: mopt = 0x0800

 	/* file types */

--- a/lib/thread/spawn+openbsd.myr

+++ b/lib/thread/spawn+openbsd.myr

@@ -53,7 +53,7 @@

 const getstk = {sz

 	var p, m

-	p = sys.mmap((0 : byte#), sz, sys.Mprotrw, sys.Mpriv | sys.Manon, -1, 0)

+	p = sys.mmap((0 : byte#), sz, sys.Mprotrw, sys.Mpriv | sys.Manon | sys.Mstack, -1, 0)

 	if p == sys.Mapbad

 		-> p

 	;;

--- a/support/syscall-gen/types+openbsd:6.3-x64.frag

+++ b/support/syscall-gen/types+openbsd:6.3-x64.frag

@@ -348,6 +348,7 @@

 const Mfixed	: mopt = 0x10

 const Mfile	: mopt = 0x0

 const Manon	: mopt = 0x1000

+const Mstack    : mopt = 0x4000

 const Mnoreplace	: mopt = 0x0800

 /* file types */