[perl #45919] [TODO] Add tests for Parrot::BuildUtil::generated_file_header

[James Keenan via RT]

particle added tests in t/configure/045-generated_file_header.t for
generated_file_header().  Tests once again cover 100% of code: 
http://thenceforward.net/parrot/coverage/configure-build/lib-Parrot-BuildUtil-pm.html.
 Resolving ticket.