systemtap: Change how systemtap looks for tracepoint header files and added dependencies

This upate fixes the following issues for systemtap:
- bnc#796574: Change how systemtap looks for tracepoint header files
- bnc#800335: Add libebl1 dependancy. Systemtap manually loads libebl backends and the manual Requires: was incorrectly removed in a previous revision

Fixed bugs
bnc#796574
systemtap cannot find any tracepoint probes
bnc#800335
devel:tools/systemtap: Undeclared dependency on libebl1
Selected Binaries
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