get rid of several "variable 'x' set but not used" warnings

Signed-off-by: Cristian Ionescu-Idbohrn <cii@axis.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/.gitignore b/.gitignore
index 7d2cca6..0a0c65b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,7 @@
 # Normal output
 #
 /busybox
+/busybox_old
 /busybox_unstripped*
 
 #