New upstream release:
Changes since v1.6.0 include:
* A number of bugfixes
* Fix many warnings with -Wsign-compare
* Add compilation with meson (not used by default so far)
* Yet another revamp of how we handle unaligned accesses
* Added a number of extra checks for common tree errors
* Checks for interrupt providers
* i2c reg properties
* Tighten checking of gpio properties
* Reduce dependencies when building libfdt only
* Allow libfdt.h header to be used from C++ more easily
* Accept .dtbo extension for overlays
* Update valid node and property characters to match current devicetree spec
* Add several checks for root node sanity in fdt_check_full()
* Somewhat more robust type labelling for the benefit of yaml output
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