memdebug.h: #undef `fclose` before defining it

Just in case, and to match the pattern used for similar redefines.

Cherry-picked from #17827

diff --git a/lib/memdebug.h b/lib/memdebug.h
index f2ebd60376fda6a91b6ef5b9243808974d0f2d96..0493bf61bc85a77f2e1d0a2078378e9b06930cbf 100644 (file)
--- a/lib/memdebug.h
+++ b/lib/memdebug.h
@@ -183,6 +183,7 @@ CURL_EXTERN ALLOC_FUNC
 #define fopen(file,mode) curl_dbg_fopen(file,mode,__LINE__,__FILE__)
 #undef fdopen
 #define fdopen(file,mode) curl_dbg_fdopen(file,mode,__LINE__,__FILE__)
+#undef fclose
 #define fclose(file) curl_dbg_fclose(file,__LINE__,__FILE__)
 
 #endif /* CURLDEBUG */