depend: display each excluded-Wine-DLL warning only once

PyInstaller/depend/dylib.py

@@ -225,6 +225,8 @@ def search(self, libname):
 
     exclude_list = WinExcludeList(exclude_list)
 
+_seen_wine_dlls = set()  # Used for warning tracking in include_library()
+
 
 def include_library(libname):
     """
@@ -239,7 +241,9 @@ def include_library(libname):
     # exclude lists. If excluded, the frozen application will still run under Wine, but if it were included, it would
     # likely cause problems under real Windows. So everything considered, we are better off excluding it.
     if compat.is_win_wine and compat.is_wine_dll(libname):
-        logger.warning("Excluding Wine built-in DLL: %s", libname)  # displayed only if DLL would have been included
+        if libname not in _seen_wine_dlls:
+            logger.warning("Excluding Wine built-in DLL: %s", libname)  # displayed only if DLL would have been included
+            _seen_wine_dlls.add(libname)  # display only once for each DLL
         return False
 
     return True