Applied patch from Mikhail Grushinskiy for mingw compiler on Windows.

* Makefile.am configure.in example/Makefile.am libxml.h nanoftp.c
  nanohttp.c xmllint.c: Applied patch from Mikhail Grushinskiy for
  mingw compiler on Windows.
Daniel
diff --git a/example/Makefile.am b/example/Makefile.am
index b78e05f..45ab56b 100644
--- a/example/Makefile.am
+++ b/example/Makefile.am
@@ -7,5 +7,6 @@
 	-I$(top_builddir)/include		\
 	-I$(top_srcdir)/include -I@srcdir@
 
-LDADD = $(top_builddir)/libxml2.la @THREAD_LIBS@ @Z_LIBS@ $(ICONV_LIBS) -lm
+LDADD = $(top_builddir)/libxml2.la @THREAD_LIBS@ @Z_LIBS@ $(ICONV_LIBS) -lm @WIN32_EXTRA_LIBADD@
+