openmotif: Use MWMRCDIR instead of rcdir in spec file

This update fixes the following issue for openmotif:
- bnc#786848: Use MWMRCDIR instead of rcdir in spec file

Fixed bugs
bnc#786848
default menu missing in openmotif-2.3.3-2.1.9 (mwm)
Selected Binaries
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