Release 2.2.19

jffi -> 1.3.15

Update version and jffi for release

[maven-release-plugin] copy for tag jnr-ffi-2.2.17

[maven-release-plugin] copy for tag jnr-ffi-2.2.16

[maven-release-plugin] copy for tag jnr-ffi-2.2.15

[maven-release-plugin] copy for tag jnr-ffi-2.2.14

[maven-release-plugin] copy for tag jnr-ffi-2.2.13

[maven-release-plugin] copy for tag jnr-ffi-2.2.12

[maven-release-plugin] copy for tag jnr-ffi-2.2.11

[maven-release-plugin] copy for tag jnr-ffi-2.2.10