[docs] winelib: Use proper entity escaping for '&','<' and '>'

[Julian Rüger]

Hi Frédéric,

> -	$(CC) $(CC_OPTS) -DRC_INVOKED -E -x c $< | $(WRC) -N $(WRCFLAGS) $(WINELIB_FLAGS) -o $@
> +	$(CC) $(CC_OPTS) -DRC_INVOKED -E -x c $lt; | $(WRC) -N $(WRCFLAGS) $(WINELIB_FLAGS) -o $@

looks like you forgot the "&".

Best,
Julian