VMS fixed in unified build

- install_sw had a display of text that belongs under the install target
- previous layout installed architecture dependent files in
  dev:['prefix'.'arch'.LIB], dev:['prefix'.'arch'.EXE] and
  dev:['prefix'.'arch'.ENGINES].  Changed to dev:['prefix'.LIB.'arch'],
  dev:['prefix'.EXE.'arch'] and dev:['prefix'.ENGINES.'arch'] instead.

Reviewed-by: Andy Polyakov <appro@openssl.org>