Return run-time zlib version from wxGetZlibVersionInfo().

Return the version really used instead of the version the code was compiled
against.

Incidentally, this avoids the use of ZLIB_VERNUM not available in old (1.1)
versions of zlib, thus fixing compilation under Solaris 10.

Closes #14158.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71056 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/zstream.cpp

@@ -47,10 +47,18 @@ enum {
 
 wxVersionInfo wxGetZlibVersionInfo()
 {
-    return wxVersionInfo("zlib",
+    int major,
-                         ZLIB_VERNUM >> 12,
+        minor,
-                         (ZLIB_VERNUM >> 8) & 0x0F,
+        build;
-                         (ZLIB_VERNUM & 0xFF) / 0x10);
+
+    if ( sscanf(zlibVersion(), "%d.%d.%d", &major, &minor, &build) != 3 )
+    {
+        major =
+        minor =
+        build = 0;
+    }
+
+    return wxVersionInfo("zlib", major, minor, build);
 }
 
 /////////////////////////////////////////////////////////////////////////////