- Update to 4.7.0:
  * This version restores in the default build the availability of
    the tools that had been dropped in v4.6.0
    See https://libtiff.gitlab.io/libtiff/rfcs/rfc2_restoring_needed_tools.html#rfc2-restoring-needed-tools
  * Software configuration changes:
    + autoconf build: configure.ac: avoid -Werror passed to CFLAGS to interfere with feature detection
    + autoconf build: fix error when running make clean (fixes issue #630)
    + autoconf build: back off the minimum required automake version to 1.11
    + autoconf.ac: fix detection of windows.h for mingw (fixes issue #605)
    + libtiff-4.pc: Fix Requires.private missing Lerc. It provides a .pc file
      starting from version 4 (in autoconf builds, we assume that liblerc is at least version 4)
    + CMake: Fix TIFF_INCLUDE_DIRS
    + CMake: MinGW compilers don't need a .def file for shared library
    + CMake: move libdeflate and Lerc to Requires.private
    + CMake: enable resource compilation on all Windows.
  * Library changes:
    + Add TIFFOpenOptionsSetMaxCumulatedMemAlloc(). This function complements
      TIFFOpenOptionsSetMaxSingleMemAlloc() to define the maximum cumulated memory
      allocations in byte, for a given TIFF handle, that libtiff internal memory
      allocation functions are allowed. 
    + TIFFWriteDirectory(): Avoid overwriting following data if an IFD is enlarged.
    + TIFFXYZToRGB: avoid integer overflow (fixes issue #644)
    + uv_decode() and uv_encode(): avoid potential out-of-bounds array index (fixes issue #645)
    + Fix cases where tif_curdir is set incorrectly. Fix cases where the current directory number (tif_curdir)
      is set inconsistently or incorrectly, depending on the previous history.
    + TIFFRead[Scanline/EncodedStrip/EncodeTile]: 0-initialize output buffer if setupdecode fails ;
      most codecs: zero-initialize (not-yet-written parts of) output buffer if failure (fixes issue #375)
    + OJPEG: reset subsampling_convert_state=0 in OJPEGPreDecode (fixes issue #183)
    + ThunderRLE: fix failure when decoding last run. Bug seen with GhostPDL
    + LERC codec: deal with issues with multi-band PlanarConfig=Contig and NaN values

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