Log message:
Remove mk/find-prefix.mk usage from the cross category.

The find-prefix infrastructure was required in a pkgviews world where
packages installed from pkgsrc could have different installation
prefixes, and this was a way for a dependency prefix to be determined.

Now that pkgviews has been removed there is no longer any need for the
overhead of this infrastructure.  Instead we use BUILDLINK_PREFIX.pkg
for dependencies pulled in via buildlink, or LOCALBASE/PREFIX where the
dependency is coming from pkgsrc.

Provides a reasonable performance win due to the reduction of `pkg_info
-qp` calls, some of which were redundant anyway as they were duplicating
the same information provided by BUILDLINK_PREFIX.pkg.

Log message:
Add SHA512 digests for distfiles for cross category

Existing SHA1 digests verified, all found to be the same on the
machine holding the existing distfiles (morden).  Existing SHA1
digests retained for now as an audit trail.

Log message:
bulk build wants flex

Log message:
Update to 20131219

Changelog:
* Improve multibyte string handling
* Improve umask, towupper/towlower, readdir, scandir, and nanosleep

Log message:
Require target binutils and bison.

Log message:
Import cross-freemint-mintlib-20130415 as cross/freemint-mintlib.

MiNTLib for FreeMiNT (OS for Atari ST) cross-compile environment.