chore, kick SXE_CHECK_LDFLAGS call from c.ac, we don't need massaging the special linker

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, don't check for gperf at configure time

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, don't check libev availability during configure

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, kick sxe-aux.m4, do Werror handling ourself

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, use CMAKE_FIND_PACKAGE to find libonion

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

* bld/dist:
  minor, use CMAKE_FIND_PACKAGE to find libonion
  chore, kick sxe-aux.m4, do Werror handling ourself
  chore, don't check libev availability during configure
  chore, don't check for gperf at configure time
  chore, kick SXE_CHECK_LDFLAGS call from c.ac, we don't need massaging the special linker
chore, hardcode onion linker and compile flags

We KNOW CMAKE_FIND_PACKAGE won't find it.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>