main
configure: libtool 1.5 tweaks
update to latest autoconf-archive macros (#936)
import more files needed by newer ax_code_coverage.m4
Autotools: rework to simplify and fix recent issues (#674)
autotools: add ax_check_gnu_make.m4
Use external GoogleTest instead of bundling it (#655)
Fix a few build issues on MidnightBSD. (#983)
autotools: add ax_require_defined.m4