git: openjdk/jfx17u: master: 8288450: Update attribution in gstreamer.md file

[Kevin Rushforth]

Changeset: edd83e3e
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2022-08-19 19:17:15 +0000
URL:       https://git.openjdk.org/jfx17u/commit/edd83e3eb7b57323dc91e1aa7ccffc4eb9943283

8288450: Update attribution in gstreamer.md file
8288449: Update attribution in glib.md file

Backport-of: 54e689ce639ee182113dab610d9ed82890493898

! modules/javafx.media/src/main/legal/glib.md
! modules/javafx.media/src/main/legal/gstreamer.md
- modules/javafx.media/src/main/native/gstreamer/3rd_party/glib/glib/valgrind.h