align descriptors to the end of the bootloader region
align descriptors to the end of the bootloader region

This will allow us to remove EP0_DATA_IN_PTRH, since all memory chunks
transmitted with ep0_read_in (i.e. descriptors) will live within the
same 256-word page. This will save us about 8 instructions.

74hc595/PIC16F1-USB-Bootloader,74hc595/PIC16F1-USB-Bootloader,74hc595/PIC16F1-USB-Bootloader