heidecjj

Fixes #23. Added a patch to gcc-7.2 to fix an internal compiler error when compiling simple programs such as a hello world program. Patch found here: https://github.com/riscv/riscv-gcc/issues/100#issuecomment-357400823.

As of Robot Framework 3.2, an argument with a default value can be represented as a `('name', 'default')` tuple. Doing so allows Robot Framework to do automatic argument type conversion...