multimedia/libva: unbreak X11=off build after 07b46bb45fbe

> Checking for pkg-plist issues (check-plist)

> Parsing plist

> Checking for items in STAGEDIR missing from pkg-plist

> Checking for items in pkg-plist which are not in STAGEDIR

Error: Missing: include/va/va_trace.h

> Error: Plist issues found.

• Error code 1

PR: 277690