[libxml2] Default to native threads on MinGW-w64

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 8575c1170b7ba14d0033a0e18bf5073a5616296d
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Oct 9 16:41:58 2017 +0200

    Default to native threads on MinGW-w64

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7aa31fa..c0c90d7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1053,9 +1053,9 @@ if test "$with_threads" = "no" ; then
 else
     echo Enabling multithreaded support
 
-    dnl Default to native threads on Win32
+    dnl Default to native threads on Windows
     case $host_os in
-       *mingw32*) if test "$with_threads" != "pthread" && test "$with_threads" != "no"; then
+       *mingw*) if test "$with_threads" != "pthread" && test "$with_threads" != "no"; then
                WITH_THREADS="1"
                THREADS_W32="1"
                THREAD_CFLAGS="$THREAD_CFLAGS -DHAVE_WIN32_THREADS"