Resolve many build warnings

This patch fixes many warnings from the beginning of the build up to
and including the depend stage. Nearly all warnings should be gone
even with -Wall.

cde/programs/dtinfo/tools/misc/pmaker.c

@@ -24,7 +24,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-main(argc, argv)
+int main(argc, argv)
 int argc ;
 char **argv ;
 {