python: Remove 'is_ruby' function
python: Remove 'is_ruby' function

This function is not used and should not be used. It does not really
make any sense.

Change-Id: I79ee7283ddbc282b9b803df33ad266b7a88a9c67
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50168
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5