Fix winecmd when Wine path contains spaces

Fix `winecmd` verb when path to Wine contains a space.

The arguments for `winetricks_shell` were passed as-is in a
space-separated string, meaning a single argument with a space in it
(eg. the Wine path) would break the entire command.

Fix this by single quoting each argument and concatenating them
together. This is a bit tricky in POSIX sh without `printf %q`,
but seems to work fine with the code suggested by ShellCheck for SC3050.

src/winetricks

@@ -19221,6 +19221,8 @@ winetricks_stats_log_command()
 winetricks_shell()
 {
     (
+        _W_escape() { printf "'%s'\\n" "$(printf '%s' "$1" | sed -e "s/'/'\\\\''/g")"; }
+
         w_try_cd "${W_DRIVE_C}"
         export WINE
 
@@ -19232,7 +19234,14 @@ winetricks_shell()
                 for term in gnome-terminal konsole Terminal xterm; do
                     if test "$(command -v ${term} 2>/dev/null)"; then
                         if [ -n "${*}" ]; then
-                            WINEDEBUG=-all ${term} -e "${*}"
+                            # Convert the list of arguments into a single
+                            # string while single quoting each argument.
+                            _W_args=""
+                            for arg in "$@"; do
+                                _W_args="${_W_args}$(_W_escape "${arg}") "
+                            done
+
+                            WINEDEBUG=-all ${term} -e "${_W_args}"
                         else
                             WINEDEBUG=-all ${term}
                         fi