patch 9.1.1654: build failure when FEAT_DIFF is not defined

Commit: 
https://github.com/vim/vim/commit/e1a435c508fe66bd05aa7e745d8f5240704025dd
Author: Christian Brabandt <c...@256bit.org>
Date:   Wed Aug 20 20:37:37 2025 +0200

    patch 9.1.1654: build failure when FEAT_DIFF is not defined
    
    Problem:  build failure when FEAT_DIFF is not defined
              (John Marriott)
    Solution: Remove FEAT_DIFF in proto.h; define dummy type for
              diffline_T and diffline_change_T when FEAT_DIFF is not defined
    
    related: #18026
    closes: #18046
    
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/proto.h b/src/proto.h
index 3c34fe813..e9e5efcbc 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -73,9 +73,7 @@ extern int _stricoll(char *a, char *b);
 # include "if_cscope.pro"
 # include "debugger.pro"
 # include "dict.pro"
-# ifdef FEAT_DIFF
 # include "diff.pro"
-# endif
 # include "linematch.pro"
 # include "digraph.pro"
 # include "drawline.pro"
diff --git a/src/structs.h b/src/structs.h
index d7b458077..0968b3c9a 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -3671,6 +3671,9 @@ struct diffline_S
     int bufidx;
     int lineoff;
 };
+#else  // FEAT_DIFF
+typedef void diffline_T;
+typedef void diffline_change_T;
 #endif
 
 #define SNAP_HELP_IDX  0
diff --git a/src/version.c b/src/version.c
index 359790bfd..0d7d245c0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1654,
 /**/
     1653,
 /**/

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