DTC 1.6.0 Changes since v1.5.1. include: * Some provision for out of tree builds (useful with meson) * Some fixes for win32 builds * Some improvements for FreeBSD builds: * Work with byacc as well as bison * Fix some compilation failures with clang * Default to cc instead of gcc * Add FreeBSD testing via Cirrus CI * Add non-x86 testing on Travis * Add options to allow builds of libfdt which sacrifice safety on bad inputs for reduced size and improved speed. This is important for some embedded cases. * Allow testsuite to be executed on an already-installed dtc/libfdt, rather than just the one built in the source tree