* include/_mingw.h: Increment version to 2.0.

* Makefile.in: Ditto.
	Merge in mingwex branch.

winsup/mingw/mingwex/vsnprintf.c

@@ -0,0 +1,5 @@
+#include <stdarg.h>
+#include <stdio.h>
+
+int vsnprintf (char* s, size_t n, const char* format, va_list arg)
+  { return _vsnprintf ( s, n, format, arg); }