Fixes for Mingw+MSYS and DLL support from Carlo Bramini

* configure.ac: Added AC_LIBTOOL_WIN32_DLL for enabling the creation of shared libraries.
* configure.ac: Added -I$(top_srcdir)/include to LIBCDIO_CFLAGS, it allows to build outside the source tree.
* configure.ac: Added LT_NO_UNDEFINED for adding '-no-undefined' switch to libtool when building win32 shared libraries.
* configure.ac: Check for Windows.h presence if under Mingw (included for using Sleep() function).
* configure.ac: Check for more missing functions: setenv(), unsetenv(), sleep(), gmtime_r(), localtime_r().

* example/cdchange.c: If sleep() function does not exist, it tries to emulate it with a similar code (require inclusion of Windows.h)

* src/cddb.c:
* lib/cdda_interface/scsi_interface.c: Compilation fails because u_int32_t is undefined. It has been changed to uint32_t to be compliant to all other parts of the libraries.
* lib/cdda_interface/Makefile.am:
* lib/iso9660/Makefile.am:
* lib/cdio++/Makefile.am:
* lib/paranoia/Makefile.am:
* lib/udf/Makefile.am:
* lib/driver/Makefile.am: added LT_NO_UNDEFINED to libtool flags.
* lib/iso9660/iso9660.c: Added replacements for setenv(), unsetenv(), gmtime_r\
(), localtime_r().

example/cdchange.c

@@ -1,5 +1,5 @@
 /*
-  $Id: cdchange.c,v 1.8 2008/03/24 15:30:55 karl Exp $
+  $Id: cdchange.c,v 1.9 2008/06/25 08:01:53 rocky Exp $
 
   Copyright (C) 2005, 2006, 2007, 2008 Rocky Bernstein <rocky@gnu.org>
   
@@ -39,6 +39,22 @@
 # include <errno.h>
 #endif 
 
+#ifdef HAVE_WINDOWS_H
+# include <windows.h>
+#endif
+
+#ifndef HAVE_SLEEP
+static void
+sleep(unsigned int ms)
+{
+#if defined(_WIN32)
+    Sleep(ms);
+#else
+#error sleep() unimplemented
+#endif
+}
+#endif
+
 #include <cdio/cdio.h>
 int
 main(int argc, const char *argv[])