applied a patch from Gerrit P. Haase to get python bindings on Cygwin

* Makefile.am config.h.in configure.in python/Makefile.am:
  applied a patch from Gerrit P. Haase to get python bindings
  on Cygwin
Daniel
diff --git a/configure.in b/configure.in
index 9c86650..b3d3ec8 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,4 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_PREREQ(2.2)
 AC_INIT(entities.c)
 AM_CONFIG_HEADER(config.h)
 AC_CANONICAL_HOST
@@ -1033,9 +1032,15 @@
  AC_DEFINE([snprintf],[_snprintf],[Win32 Std C name mangling work-around])
  AC_DEFINE([vsnprintf],[_vsnprintf],[Win32 Std C name mangling work-around])
  ;;
+ *-*-cygwin*)
+ CYGWIN_EXTRA_LDFLAGS="-no-undefined"
+ CYGWIN_EXTRA_PYTHON_LIBADD="-L/usr/lib/python2.3/config -lpython2.3"
+ ;;
 esac
 AC_SUBST(WIN32_EXTRA_LIBADD)
 AC_SUBST(WIN32_EXTRA_LDFLAGS)
+AC_SUBST(CYGWIN_EXTRA_LDFLAGS)
+AC_SUBST(CYGWIN_EXTRA_PYTHON_LIBADD)
 
 AC_SUBST(CPPFLAGS)
 AC_SUBST(CFLAGS)