`py` is not installed by default *and* trying to run it results in a
popup asking if you want to install it. `python3` is installed by
default.
This hopefully should not be too disruptive to people on Windows, since
they should be going through `x.ps1` instead anyway. Just in case, I've
added a check for Cygwin and Msys (i'm not sure how else you'd get a
bash shell on windows).
When bootstrapping from outside of the rust source,
instead of calling 'x' from the absolute path
(like /home/user/rust/x), we should be able to link 'x'
from the rust source to binary paths so it can be used easily.
Before this change, 'x' was not capable of finding 'x.py' when
called from the linked file.
Signed-off-by: onur-ozkan <work@onurozkan.dev>
