fix, PEBKAC, don't mention unserding.h in header_HEADERS twice

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
Merge branch 'bld/dist'

* bld/dist:
  fix, PEBKAC, don't mention unserding.h in header_HEADERS twice
fix, PEBKAC, don't overquote OPTIONS

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>