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Add a 'run' function to libstd.

	It's useful, and it was missing.

--- a/lib/std/spork.myr

+++ b/lib/std/spork.myr

@@ -1,15 +1,33 @@

 use "die"

+use "errno"

 use "execvp"

 use "fmt"

 use "result"

 use "syswrap"

-use "errno"

+use "wait"

 pkg std =

+	const run	: (cmd : byte[:][:]	-> waitstatus)

 	const spork	: (cmd : byte[:][:]	-> result((pid, fd, fd), errno))

 	const espork	: (cmd : byte[:][:]	-> result((pid, fd, fd, fd), errno))

 	const filterfd	: (fd : fd, cmd  : byte[:][:] -> result(pid, errno))

 ;;

+

+const run = {cmd

+	var pid

+

+	pid = fork()

+	/* error  */

+	if pid < 0

+		-> `Waiterror

+	elif pid == 0

+		execvp(cmd[0], cmd)

+		die("failed exec\n")

+	else

+		-> wait(pid)

+	;;

+}

+

 const spork = {cmd

 	var infds : fd[2], outfds : fd[2]