Log message:
Fix serious bug where BUILDLINK_PACKAGES wasn't being ordered properly
by moving the inclusion of buildlink3.mk files outside of the protected
region.  This bug would be seen by users that have set PREFER_PKGSRC
or PREFER_NATIVE to non-default values.

BUILDLINK_PACKAGES should be ordered so that for any package in the
list, that package doesn't depend on any packages to the left of it
in the list.  This ordering property is used to check for builtin
packages in the correct order.  The problem was that including a
buildlink3.mk file for <pkg> correctly ensured that <pkg> was removed
from BUILDLINK_PACKAGES and appended to the end.  However, since the
inclusion of any other buildlink3.mk files within that buildlink3.mk
was in a region that was protected against multiple inclusion, those
dependencies weren't also moved to the end of BUILDLINK_PACKAGES.

Log message:
BUILDLINK_DEPENDS.<pkg> should be appended to, not set.

Log message:
Reorder location and setting of BUILDLINK_PACKAGES to match template
buildlink3.mk file in revision 1.101 of bsd.buildlink3.mk.

Log message:
PKGCONFIG_OVERRIDE is relative to WRKSRC.

Log message:
LIBTOOL_OVERRIDE and SHLIBTOOL_OVERRIDE are now lists of shell globs
relative to ${WRKSRC}.  Remove redundant LIBTOOL_OVERRIDE settings that
are automatically handled by the default setting in bsd.pkg.mk.

Log message:
Buildlink3-ify this package

Log message:
replace deprecated USE_GMAKE with USE_GNU_TOOLS+=make.

Log message:
Bump package revisions for tiff update.
Tiff is backward compatible, but was broken on amd64 platform
so this makes sure new tiff is used.

Log message:
Bump PKGREVISION for atk library major bump.

Log message:
As pointed out by jlam:
bump PKGREVISION on packages depending on graphics/glu due to latest shlib
changes there.