patch 8.2.2932: select mode test fails

Problem:    Select mode test fails.
Solution:   Do not always reset the held mouse button.
diff --git a/src/proto/normal.pro b/src/proto/normal.pro
index a1e31b3..30f360b 100644
--- a/src/proto/normal.pro
+++ b/src/proto/normal.pro
@@ -3,6 +3,7 @@
 void normal_cmd(oparg_T *oap, int toplevel);
 void check_visual_highlight(void);
 void end_visual_mode(void);
+void end_visual_mode_keep_button(void);
 void reset_VIsual_and_resel(void);
 void reset_VIsual(void);
 void restore_visual_mode(void);