testing/docbook2mdoc: strtonum fixes
Adjust strtonum patch:
Add compat.h header with declaration of strtonum(). Add compat.h include to parse.c. Remove OpenBSD weak alias macro from strtonum source; not needed for this.
Adjust strtonum patch:
Add compat.h header with declaration of strtonum(). Add compat.h include to parse.c. Remove OpenBSD weak alias macro from strtonum source; not needed for this.