tic writes all our terminfo files into a subdirectory. This is
difficult for meson to groc; you can for example not say
output: ['f/foot', 'f/foot-direct']
This tries to workaround it by setting 'install: false' in the 'tic'
custom target, and instead add two separate targets for each terminfo
file.
Since the compiled terminfo file 'foot' would collide with the
executable 'foot', all terminfo stuff has been moved into a
subdirectory.
