Update configure.mk.org header comment
Properly close each filehandle.
Fix variable parsing regex in files.pl and mkfiles
Add TOP= as an argument to files.pl
Add whrlpool and camellia .s files to perlasm list
Remove short-circuit to allow GitMake test to pass

Removing this code allowed GitMake to successfully build and run all the
tests.
Make files.pl load configure.mk

This is necessary since BUILDENV no longer exists.