Merge branch 'maint-1.6.0' into maint

* maint-1.6.0:
  grep: pass -I (ignore binary) down to external grep

Author: gitster

builtin-grep.c

@@ -291,6 +291,8 @@ static int external_grep(struct grep_opt *opt, const char **paths, int cached)
 		push_arg("-E");
 	if (opt->regflags & REG_ICASE)
 		push_arg("-i");
+	if (opt->binary == GREP_BINARY_NOMATCH)
+		push_arg("-I");
 	if (opt->word_regexp)
 		push_arg("-w");
 	if (opt->name_only)