Don't redirect --usercache-path

.github/workflows/ci-main.yml

@@ -123,7 +123,7 @@ jobs:
         if: success() || steps.build.outcome == 'success'
         run: |
           ./wesnoth --version
-          for opt in data userdata
+          for opt in data userdata usercache
           do
             output=$(./wesnoth --nobanner --"$opt"-path)
             if [ "$output" = "" ]; then printf 'option --%s-path prints nothing to stdout!\n' "$opt" >&2; exit 1; fi

src/wesnoth.cpp

@@ -299,6 +299,7 @@ static int process_command_args(commandline_options& cmdline_opts)
 			// command line options that imply not redirecting output to a log file
 			&& !cmdline_opts.data_path
 			&& !cmdline_opts.userdata_path
+			&& !cmdline_opts.usercache_path
 			&& !cmdline_opts.version
 			&& !cmdline_opts.simple_version
 			&& !cmdline_opts.logdomains