Log Message:
devel/ruby-ffi: update to 1.15.5

1.15.5 (2022-01-10)

Fixed:

* Fix long double argument or return values on 32bit i686. #849
* FFI::ConstGenerator: avoid usage of the same binary file simultaneously. #929

Added:

* Add Windows fat binary gem for Ruby-3.1

Removed:

* Remove Windows fat binary gem for Ruby < 2.4