kernel32: Use setproctitle where applicable to set the process name.

Based on a patch by Kris Moore.
diff --git a/configure.ac b/configure.ac
index 6f7f063..b81e11c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1364,6 +1364,7 @@
 	rfork \
 	sched_yield \
 	select \
+	setproctitle \
 	setrlimit \
 	settimeofday \
 	sigaltstack \