cosmetics, lose HAVE_LIBEV conditional and associate BUILT_SOURCES with tool specs directly

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

* bld/dist:
  cosmetics, lose HAVE_LIBEV conditional and associate BUILT_SOURCES with tool specs directly
Merge branch 'next'

* next:
  cosmetics, lose HAVE_LIBEV conditional and associate BUILT_SOURCES with tool specs directly