ndi: Add support for loading NDI SDK v6

The library name and environment variable name have changed but the ABI is completely compatible.

assigned to @gstreamer-merge-bot

mentioned in commit slomo/gst-plugins-rs@30252a1b

added 3 commits

• 0865d613...1e964233 - 2 commits from branch gstreamer:main
• 30252a1b - ndi: Add support for loading NDI SDK v6

Compare with previous version

merged

changed milestone to %0.13.0

added 0.12 Needs backport labels

mentioned in commit gstreamer-backport-bot/gst-plugins-rs@8e60769f

added Backported into 0.12 label and removed Needs backport label

Merge Request for backport into 0.12 branch: !1615 (merged) (target milestone: 0.12.7)

mentioned in merge request !1615 (merged)