63d0a079e0 build: dont compile rapidcheck with -Wall (fanquake)
Pull request description:
Fixes#16062.
Remove `-Wall` from the rapidcheck build flags pre compilation.
Discussed briefly with theuni.
ACKs for top commit:
MarcoFalke:
ACK 63d0a079e0 (checked that `RAPIDCHECK=1 make rapidcheck` fails without this)
Tree-SHA512: 6cb3653221c1eadbc8da54812298a061130b4377da6f63dcc2dfb97379d303b4db538e67f4fe3c96a03ee6a1e65840f0def0ac4e862553480c7ac4bdcc77e113