New build menu to select optional features on chips with small flash #6244
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Add a new "optional features" menu to "make menuconfig" for chips with limited code size (the atmega168, ar100, stm32f031, stm32f042, and pru). This menu allows a user to select optional code features (bitbanging support, display support, sensor support, software spi, and software i2c).
This fixes the build for the stm32f042, in that it allows users to disable software i2c support (or some other feature) to make the build fit within the chip flash again.
-Kevin