minor, switch to ax_lib_ev.m4 for libev detection

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, check if tcp and udp splicing is possible

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, call AC_CHECK_HEADER([ev.h]) solely for the side-effect of defining HAVE_EV_H

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bld/dist' into next

* bld/dist:
  minor, call AC_CHECK_HEADER([ev.h]) solely for the side-effect of defining HAVE_EV_H
  minor, check if tcp and udp splicing is possible
  minor, switch to ax_lib_ev.m4 for libev detection
Merge branch 'next'

* next:
  minor, call AC_CHECK_HEADER([ev.h]) solely for the side-effect of defining HAVE_EV_H
  minor, check if tcp and udp splicing is possible
  minor, switch to ax_lib_ev.m4 for libev detection