Add a mega-patch, which makes the library usable. It barely worked on

even i386 before, and does not anymore, as its numerous original bugs
were exposed by the evolving compiler. It never worked on a 64-bit
platform, as the original authors assumed sizeof(long) to be 4.

With this patch it compiles cleanly (WARNS=3) on both i386 and amd64
and should have no problems on other 64-bit systems.

A corrupt input-file may still result in a crash, but, at least, it
works correctly with correct input files. Tested on camera-generated
originals kindly provided by the originator of the PR below.

Bump PORTREVISION.

Approved by:	portmgr (pav, after some deliberations)

Portmgr advised against bumping the SHLIB_MAJOR. They did not /insist/
so I chose to bump it -- the old version is too broken to have been
usable to anybody for years, and the dependant ports (such as Graphics
and ImageMagicks) need an easy way to insist on the new version (via
LIB_DEPENDS).

Was required to fix:	67815

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