fix: state alias, test and game versions from code

An alias carries the version of the profile it aliases (version_basis
kind alias): mednafen_saturn and mednafen_vb read v1.32.1 and v1.31.0,
the mupen64plus_next builds 2.6.0, flycast_gles2 the flycast tag form.
The libretro-samples test cores without a pin take the commit their
profiled_date names and read library_version there.

emulators/video_processor.yml

@@ -9,6 +9,10 @@ profiled_date: "2026-09-17"
 source_commit: "8fe4751f0039a1b645bf750531fcfc234958a7ac"
 upstream_commit: "c608ced893583e0a8a8153890f99453fd1647d53"
 core_version: "0.0.2"
+version_basis:
+  kind: file
+  path: "video_processor_v4l2.c"
+  pattern: '#define LIBRARY_VERSION\s+"([^"]+)"'
 display_name: "Video Processor (V4L2)"
 cores:
   - video_processor