Log Message:
devel/ruby-ffi: update to 1.15.3

1.15.3 / 2021-06-16

Fixed:

* Fix temporary packaging issue with libffi. #904

1.15.2 / 2021-06-16

Added:

* Add support for Windows MINGW-UCRT build. #903
* Add /opt/homebrew/lib/ to fallback search paths to improve homebrew
  support. #880 #882

Changed:

* Regenerate types.conf for FreeBSD12 aarch64. #902