proto: Rename 'omx_moldudp.h' to 'omx_moldudp_message.h'

Follow the existing naming convention.

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Makefile: Install 'omx_moldudp_message.h'

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Merge pull request #18 from jvirtanen/fixes/omx-moldudp

Fix NASDAQ OMX MoldUDP 1.02a support