…alues for 32-bit

9f8e7b0b3b787b873045a4a8194e77d0b0a2b3b6 node: cap -dbcache to 1GiB on 32-bit architectures (Antoine Poinsot)
2c43b6adebbfabb3c8dd82fe821ce0a5d6173b3b init: cap -maxmempool to 500 MB on 32-bit systems (Antoine Poinsot)

Pull request description:

  32-bit architecture is limited to 4GiB of RAM, so it doesn't make sense to set a too high value. A too high value could cause an OOM unbeknownst to the user a while after startup as mempool / dbcache fills.

ACKs for top commit:
  achow101:
    ACK 9f8e7b0b3b787b873045a4a8194e77d0b0a2b3b6
  instagibbs:
    utACK 9f8e7b0b3b787b873045a4a8194e77d0b0a2b3b6
  dergoegge:
    Code review ACK 9f8e7b0b3b787b873045a4a8194e77d0b0a2b3b6
  glozow:
    utACK 9f8e7b0b3b787b873045a4a8194e77d0b0a2b3b6

Tree-SHA512: cc7541b2c0040fc21a43916caec464dfb443af808f4e85deffa1187448ffff6edb0d69f9ebdb43915d145b8b4694d8465afe548f88da53ccebc9ce4b7c34b735