Add: support filtering content entries for patchpacks (#9541)

This changes nothing for us, but allows patchpacks to add the
right pieces of code to start filtering content entries on patchpack
only entries.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/rev.h b/src/rev.h
index 768938371..38883d1cc 100644
--- a/src/rev.h
+++ b/src/rev.h
@@ -16,6 +16,7 @@ extern const char _openttd_revision_hash[];
 extern const char _openttd_revision_year[];
 extern const byte _openttd_revision_modified;
 extern const byte _openttd_revision_tagged;
+extern const char _openttd_content_version[];
 extern const uint32 _openttd_newgrf_version;
 
 bool IsReleasedVersion();