www/rubygem-passenger: Update to 6.0.19

- Update WWW
- Use ECHO_CMD instead of ECHO
- Clean up Makefile
  - Remove unnecessary USES=shebangfix
  - Remove CPE_PRODUCT
  - Remove RAKE_BIN
  - Remove no-op REINPLACE_CMD
- Take maintainership

Changes:	https://github.com/phusion/passenger/releases