[3.0] OpenMAX IL: add more missing extern qualifiers
Amends 8e50cc98.
This should fix #24617 (closed), which is still an issue on 3.0.x (cf. #27256 (closed)).
Amends 8e50cc98.
This should fix #24617 (closed), which is still an issue on 3.0.x (cf. #27256 (closed)).
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