Merge topic 'drop-HP-UX'

49640d36 HP-UX: Drop support for building CMake on HP-UX
acd462dd README: Add AIX to list of supported platforms

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1105
Status Job ID Name Coverage
  External
passed cmake-moonshade-osx-debug-ninja

passed cmake-moonshade-osx-debug-ninja

passed cmake-moonshade-osx-debug-ninja

passed cmake-moonshade-osx-debug-ninja

passed cmake-moonshade-osx-debug-ninja

passed cmake-moonshade-osx-debug-ninja

00:08:26