[libxml2] Remove -Wredundant-decls

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 17d505e2d23fd7498d7e5ac6ff24b9888c25c5d4
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Fri Sep 2 17:33:42 2022 +0200

    Remove -Wredundant-decls
    
    Some Python headers contain redundant redeclarations.

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 3b3c9030..b8c4bc78 100644
--- a/configure.ac
+++ b/configure.ac
@@ -590,7 +590,7 @@ else
     fi
 
     # warnings we'd like to see
-    EXTRA_CFLAGS="${EXTRA_CFLAGS} -pedantic -Wall -Wextra -Wshadow -Wpointer-arith -Wcast-align 
-Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline 
-Wredundant-decls"
+    EXTRA_CFLAGS="${EXTRA_CFLAGS} -pedantic -Wall -Wextra -Wshadow -Wpointer-arith -Wcast-align 
-Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline"
     # warnings we'd like to suppress
     EXTRA_CFLAGS="${EXTRA_CFLAGS} -Wno-long-long -Wno-format-extra-args"
     case "${host}" in