cosmetics, talk about libev even in comments, in SXE_CHECK_LIBEV (was expat left-overs)

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

* bld/dist:
  cosmetics, talk about libev even in comments, in SXE_CHECK_LIBEV (was expat left-overs)
Merge branch 'next'

* next:
  cosmetics, talk about libev even in comments, in SXE_CHECK_LIBEV (was expat left-overs)
  fix, PEBKAC, properly quote cases in PKG_CHECK_MODULES_HEADERS()