[libxml2] Fix version parsing in win32/configure.js

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 5614c0785470e906eb5fcffad10c6032e56ff31d
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Sep 21 10:55:45 2020 +0200

    Fix version parsing in win32/configure.js
    
    Adjust to configure.ac changes.
    
    Should fix #185.

 win32/configure.js | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)
---
diff --git a/win32/configure.js b/win32/configure.js
index e2ab31da2..3d407b8e2 100644
--- a/win32/configure.js
+++ b/win32/configure.js
@@ -208,15 +208,15 @@ function discoverVersion()
        while (cf.AtEndOfStream != true) {
                ln = cf.ReadLine();
                s = new String(ln);
-               if (s.search(/^LIBXML_MAJOR_VERSION=/) != -1) {
-                       vf.WriteLine(s);
-                       verMajor = s.substring(s.indexOf("=") + 1, s.length);
-               } else if(s.search(/^LIBXML_MINOR_VERSION=/) != -1) {
-                       vf.WriteLine(s);
-                       verMinor = s.substring(s.indexOf("=") + 1, s.length);
-               } else if(s.search(/^LIBXML_MICRO_VERSION=/) != -1) {
-                       vf.WriteLine(s);
-                       verMicro = s.substring(s.indexOf("=") + 1, s.length);
+               if (m = s.match(/^m4_define\(\[MAJOR_VERSION\], (\w+)\)/)) {
+                       vf.WriteLine("LIBXSLT_MAJOR_VERSION=" + m[1]);
+                       verMajor = m[1];
+               } else if(m = s.match(/^m4_define\(\[MINOR_VERSION\], (\w+)\)/)) {
+                       vf.WriteLine("LIBXSLT_MINOR_VERSION=" + m[1]);
+                       verMinor = m[1];
+               } else if(m = s.match(/^m4_define\(\[MICRO_VERSION\], (\w+)\)/)) {
+                       vf.WriteLine("LIBXSLT_MICRO_VERSION=" + m[1]);
+                       verMicro = m[1];
                } else if(s.search(/^LIBXML_MICRO_VERSION_SUFFIX=/) != -1) {
                        vf.WriteLine(s);
                        verMicroSuffix = s.substring(s.indexOf("=") + 1, s.length);