ghostscript: update GsDjVu version & fix warnings.

--with-djvu was using slightly old code and producing warnings builds clean now on osx 10.9
djvulibre: fix corrupt djvu output with Mavericks

clang+libcxx builds. patch from: https://sourceforge.net/p/djvu/djvulibre-git/ci/2c904e0cb8314c0d2314331e5ac1eaf65a7757b4/

Also, install doc/ & add test case installs some djvu-format files so we can run a functional test on the built binaries.
djvulibre: add 3.5.25.4 bottle.
ghostscript: update 9.14 bottle.

Closes #29455.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>