With gcc10 and newer, the `-fno-common` option is the default, causing
issues for global variables with multiple declarations that are missing the `external` initializer.
See https://wiki.gentoo.org/wiki/Project:Toolchain/Gcc_10_porting_notes/fno_common for a summary.
Added a couple of patches to fix building for older `advmame` versions:
* for `advmame-1.4`, pick https://github.com/amadvance/advancemame/commit/f8688cae05
* for `advmame-0.94`, created a separate patch
As a minor modification, used the scriptmodule `md_path` variable to calculate the patch folder location.
* rework patch code
* use 0.94 instead of 0.94.0
* make advmame always be the latest advmame version with advmame.rc as the config
* remove any old emulator.cfg entries
* update advmame to v3.3
