libtiff: introduce libtiff_4_5

With the update to libtiff 4.6 in
0a74a54ac2600656cd0b640d5ea1c8efb5c35d68 ,
many tiff-processing utility executables got dropped:

http://www.simplesystems.org/libtiff/releases/v4.6.0.html

Some of these executables can still be "restored" with
the configure switch `--enable-tools-unsupported`,
but unfortunatelly,
at least hylafaxplus (maybe more packages) relies on
utilities that even cannot be restored with this switch.

The commit at hand reintroduces the old libtiff
version 4.5.1 as `libtiff_4_5` into nixpkgs.
It restores the old build recipe with the following changes:

* passthru.updateScript is dropped as it is of no use here
* passthru.tests is dropped as it only contains
  packages that now build with the new libtiff version
* patches are applied for the two CVEs that are fixed in 4.6.0

As libtiff 4.5 is no longer supported by libtiff developers,
new vulnerabilities will likely go unnoticed
unless they also affect the current version.
To not disable hydra builds, we don't add
`knownVulnerabilities` *for now*, but add comments to alert
updaters of the current libtiff version so patches can
be backported or the situation be reevaluated as a whole.

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