Update .gitignore to ignore all cscope files

Signed-off-by: NRich Salz <rsalz@akamai.com>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

.gitignore

@@ -87,7 +87,7 @@ Makefile.save
 *.bak
 /tags
 /TAGS
-cscope.out
+cscope.*
 *.d
 /crypto.map
 /ssl.map