Hi nice,
I have not seen any ST7735 library alternatives that do not depend on AVR. Any library that refers to AVR will not work. If by modifying the code allows the sketch to compile, there is a big chance it will not run properly. The reason being that AVR refer to registers found on the Atmel chip on Arduino Boards and Galileo has a Quark x86 processor.
Regards,
Intel_Jesus