Add the Portugese/Spanish keymap. Similarly to the Finnish/Swedish
keymap, it's compatible with both Portugese and Spanish keyboards.
Also, modify x11-keymap so that the Portugese/Spanish map will use
Alt+Shift to enter an underscore in the F key and a backslash in the C
key, which was done to avoid redundancy with the "Ñ" key.
Signed-off-by: Lux Aliaga <lux@nixgoat.me
[ci:skip-build] already built successfully in CI
Explicitly set Fn key as Mod5. In xkeyboard-config up to 2.36, this was somehow
set implicitly, since it was working, although I am not sure where/how. In 2.37
it only works when specified.
[ci:skip-build]: already built successfully in CI
