Portability fixes:
* Fix <sys/fcntl.h> in client/adnsresfilter.c to <fcntl.h>.
- * #include <sys/types.h> and <unistd.h> for fcntl in */*.c.
+ * Add missing <sys/types.h>, <unistd.h>, <time.h>, <sys/time.h>.
* Cope with compilers that don't do `inline'.
* Do not use variadic macro, use stdarg instead (adnslogres.c).
* #include "config.h" before "adns.h".
* Cast a sizeof(...) in src/event.c to unsigned long before printing.
* #include <sys/select.h> if it exists.
* Regression tests work better if some syscalls are already macros.
+ * Add pre-generated versions of m4-generated files in regress/.
Portability cleanups:
* Add list of tested platforms in INSTALL file.