avtools: add -v as alias for -loglevel

This saves a bit of typing.

Signed-off-by: Mans Rullgard <mans@mansr.com>

cmdutils.c

@@ -335,6 +335,8 @@ static int locate_option(int argc, char **argv, const OptionDef *options, const
 void parse_loglevel(int argc, char **argv, const OptionDef *options)
 {
     int idx = locate_option(argc, argv, options, "loglevel");
+    if (!idx)
+        idx = locate_option(argc, argv, options, "v");
     if (idx && argv[idx + 1])
         opt_loglevel("loglevel", argv[idx + 1]);
 }