[4.0] 86c21b6 Squash cosmetic compile error on ARMv7l

[Lasse Karstensen]

commit 86c21b6f9abeb1aec918b3588642c720facb2014
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Wed Feb 19 14:57:43 2014 +0100

    Squash cosmetic compile error on ARMv7l

diff --git a/bin/varnishncsa/varnishncsa.c b/bin/varnishncsa/varnishncsa.c
index c7157f4..7434070 100644
--- a/bin/varnishncsa/varnishncsa.c
+++ b/bin/varnishncsa/varnishncsa.c
@@ -853,7 +853,7 @@ dispatch_f(struct VSL_data *vsl, struct VSL_transaction * const pt[],
 int
 main(int argc, char * const *argv)
 {
-	char opt;
+	signed char opt;
 	char *format = NULL;
 
 	memset(&CTX, 0, sizeof CTX);