host: fix include with newer uhd

Added explicit include of #include <boost/cstdint.hpp>
The uhd header wb_iface.hpp has moved from boost cstdint
to regular stdint.h and thus is lacking the boost include.

host/umtrx_fifo_ctrl.hpp

@@ -23,6 +23,7 @@
 #include <uhd/transport/zero_copy.hpp>
 #include <boost/shared_ptr.hpp>
 #include <boost/utility.hpp>
+#include <boost/cstdint.hpp>
 #include <uhd/types/wb_iface.hpp>
 #include <string>