lib: pull in config.h in some files

If the UCLINUX symbol is being defined by way of config.h, we need to
include that header in order to notice.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/lib/parse_opts.c b/lib/parse_opts.c
index 3bc304c..8276a2e 100644
--- a/lib/parse_opts.c
+++ b/lib/parse_opts.c
@@ -68,6 +68,7 @@
  *	This pointer is (char *)NULL if parsing is successful.
  *
  *#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#**/
+#include "config.h"
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>