We no longer support Code::Blocks, so removing the build files for it.
CMake can be used for Linux builds instead.

Change-Id: I1af29904078270898a3c07915cf32ca4ee4da25a
Reviewed-on: https://swiftshader-review.googlesource.com/8255Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>