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Use pid type in sys-osx.myr

    This means that we're not only a bit more type safe, we
    have enough type compatibility that std.spork() compiles.

--- a/libstd/sys-osx.myr

+++ b/libstd/sys-osx.myr

@@ -5,6 +5,7 @@

 	type scno 	= int64	/* syscall */

 	type fdopt	= int64	/* fd options */

 	type fd		= int32	/* fd */

+	type pid	= int64	/* pid */

 	type mprot	= int64	/* memory protection */

 	type mopt	= int64	/* memory mapping options */

 	type socktype	= int64	/* socket type */

@@ -553,11 +554,11 @@

 	/* process control */

 	const exit	: (status:int -> void)

-	const getpid	: ( -> int64)

-	const kill	: (pid:int64, sig:int64 -> int64)

-	const fork	: (-> int64)

-	const wait4	: (pid:int64, loc:int32#, opt : int64, usage:rusage#	-> int64)

-	const waitpid	: (pid:int64, loc:int32#, opt : int64	-> int64)

+	const getpid	: ( -> pid)

+	const kill	: (pid : pid, sig:int64 -> int64)

+	const fork	: (-> pid)

+	const wait4	: (pid : pid, loc:int32#, opt : int64, usage:rusage#	-> int64)

+	const waitpid	: (pid : pid, loc:int32#, opt : int64	-> int64)

 	const execv	: (cmd : byte[:], args : byte[:][:] -> int64)

 	const execve	: (cmd : byte[:], args : byte[:][:], env : byte[:][:] -> int64)