Try to find BZip2
New in version 3.12.
This module defines
BZip2 has been found.
This module defines the following variables:
system has BZip2
New in version 3.12: the BZip2 include directories
Link these to use BZip2
this is set if the functions are prefixed with
the version of BZip2 found
The following cache variables may also be set:
the BZip2 include directory