stringcomp: Make test more punishing

stringcomp: Make test more punishing

Recreate the old test/dump scenario, where we test the following map:
  - rules: evdev
  - model: pc104
  - layout #1: us
  - layout #2: ru
  - layout #3: ca(multix)
  - layout #4: de(neo)

This is ever so slightly altered from the xkbcomp output; running the
following:
setxkbmap -rules evdev -model pc105 -layout us,ru,ca,de -variant
,,multix,neo -print | xkbcomp -xkb - -

will give you a map with RCTL added to the modifier_map for both Control
and Mod3.  Running the output through xkbcomp -xkb - - again, will give
you RCTL only added to Mod3.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>