bug#25315: more missing inputs

[Ricardo Wurmus <rekado@elephly.net>]

There are many more tools whose availability is checked for at runtime.

    @tool_required('bzip2')
    @tool_required('cbfstool')
    @tool_required('cd-iccdump')
    @tool_required('cmp')
    @tool_required('colordiff')
    @tool_required('cpio')
    @tool_required('diff')
    @tool_required('enjarify')
    @tool_required('getfacl')
    @tool_required('ghc')
    @tool_required('gpg')
    @tool_required('gzip')
    @tool_required('img2txt')
    @tool_required('isoinfo')
    @tool_required('javap')
    @tool_required('lipo')
    @tool_required('llvm-bcanalyzer')
    @tool_required('llvm-dis')
    @tool_required('lsattr')
    @tool_required('msgunfmt')
    @tool_required('nm')
    @tool_required('objcopy')
    @tool_required('objdump')
    @tool_required('otool')
    @tool_required('pdftk')
    @tool_required('pdftotext')
    @tool_required('pedump')
    @tool_required('ppudump')
    @tool_required('ps2ascii')
    @tool_required('readelf')
    @tool_required('rpm2cpio')
    @tool_required('showttf')
    @tool_required('sng')
    @tool_required('sqlite3')
    @tool_required('stat')
    @tool_required('unsquashfs')
    @tool_required('xxd')
    @tool_required('xz')
    @tool_required('zipinfo')

Not all of them are necessarily needed in a default installation of
diffoscope, but at least some of them are required.

-- 
Ricardo

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