* fix armadillo macro expansions
- most compilers `#define linux 1`
- armadillo does raw pasting of include directories in code
- this means macro expansion of `linux-x86_64` -> `1-x86_64`
- new version, previous download url seems broken
- lib64 instead of lib?
- needs verification, was required for intel, works for others
* flake8: two spaces is modules, one for classes
* add some explanation of how the patch works
* use p1 patch file with -U0 to prepend undef linux
* armadillo v8.100.1
be2be8c70e