Log Message:
shapelib: update to 1.6.0.

Changes since v1.5.0:

    shapefil.h: add SHAPELIB_VERSION_MAJOR/MINOR/MICRO, SHAPELIB_VERSION_NUMBER, \ 
and SHAPELIB_AT_LEAST macros
    Compiler warning fixes and various code cleanups
    SAHooks: add a void *pvUserData member. ABI change
    SAHooks.FOpen and FClose callbacks: add a void *pvUserData parameter. API \ 
and ABI change
    SAHooks.FWrite: make first parameter a const void*. API change
    Distribute LICENSE-LGPL and LICENSE-MIT files instead of COPYING file. Do \ 
not distribute INSTALL file
    Use standard integer data types
    Changes to allow building with cmake -DCMAKE_UNITY_BUILD=ON
    Polygon writing: avoid considering rings slightly overlapping as inner-outer \ 
rings of others (refs OSGeo/gdal#5315)
    Polygon writing: consider rings at non-constant Z as outer rings (fixes \ 
OSGeo/gdal#5315) As noted in code comments, this is an approximation of more \ 
complicated tests we'd likely have to do, that would take into account real \ 
co-planar testing, to allow detecting inner rings of outer rings in an oblique \ 
plane.
    shpopen.c: Communicate why the file size cannot be reached when appending \ 
features (OSGeo/gdal#4140) Clearly state why the file size cannot be reached. \ 
This is important in order to correctly inform the user and prevent him/her from \ 
looking for other reasons. Related to qgis/QGIS#44202
    SHPWriteObject(): prevent potential overflows on 64-bit platforms on huge \ 
geometries
    SHPRestoreSHX: update SHX content length even if error occurred
    In creation, uses w+b file opening mode instead of wb followed by r+b, to \ 
support network file systems having sequential write only and when using \ 
CPL_VSIL_USE_TEMP_FILE_FOR_RANDOM_WRITE=YES (fixes OSGeo/gdal#7801)
    Fix adding features in a .dbf without columns (fixes qgis/QGIS#51247)
    Have matching SOVERSION for CMake and autotools
    Code reformatting
    Enable contrib/csv2shp build with MSVC
    Build contributed utilities via CMake
    Use the the standard BUILD_TESTING CMake variable
    Remove double free() in contrib/shpsrt (CVE-2022-0699)
    SHPRestoreSHX: fix for (64 bit) big endian
    Add config-style support for find_package(shapefile)
    Prevent no-op FSeeks writing dbf & shp records for network filesystem \ 
performance