[libxml2] Don't set HAVE_WIN32_THREADS in win32config.h

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 422176ad2960c7368e011520b2ba76e91b1babe0
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sat Mar 5 03:18:58 2022 +0100

    Don't set HAVE_WIN32_THREADS in win32config.h
    
    This flag must be set on the command line.

 include/win32config.h | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/include/win32config.h b/include/win32config.h
index 79569adb..4f99ae0b 100644
--- a/include/win32config.h
+++ b/include/win32config.h
@@ -17,7 +17,5 @@
 #define vsnprintf _vsnprintf
 #endif
 
-#define HAVE_WIN32_THREADS
-
 #endif /* __LIBXML_WIN32_CONFIG__ */