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* Add typedef for putc1, fn_putc1_t. Replaced relevant usage of `(void *)` with `fn_putc1_t`. Correct usage of `ets_putc()`, returning 0, in libc_replacement.cpp This PR assumes PR https://github.com/esp8266/Arduino/pull/6489#issue-315018841 has merged and removes `uart_buff_switch` from `umm_performance.cpp` Updated method of defining `_rom_putc1` to be more acceptable (I hope) to the new compiler. * Use PROVIDE to expose ROM function entry point, ets_uart_putc1. Added comments to ets_putc() and ets_uart_putc1() to explain their differences. Change prototype of ets_putc() to conform with fp_putc_t. Updated _isr_safe_printf_P to use new definition, ets_uart_putc1.