patch for cross-compilation to Windows from Christophe de VIENNE. Daniel

* Makefile.am: patch for cross-compilation to Windows from
  Christophe de VIENNE.
Daniel
diff --git a/Makefile.am b/Makefile.am
index 02a4013..f9feb84 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -17,7 +17,7 @@
 lib_LTLIBRARIES = libxml2.la
 libxml2_la_LIBADD = @THREAD_LIBS@ @Z_LIBS@ $(ICONV_LIBS) @M_LIBS@ @WIN32_EXTRA_LIBADD@
 
-libxml2_la_LDFLAGS = -version-info @LIBXML_VERSION_INFO@
+libxml2_la_LDFLAGS = @WIN32_EXTRA_LDFLAGS@ -version-info @LIBXML_VERSION_INFO@
 
 if WITH_TRIO_SOURCES
 libxml2_la_SOURCES = SAX.c entities.c encoding.c error.c parserInternals.c  \