poppler: Added requirement for libpoppler-cpp to libpoppler-devel

This update fixes the following issue with poppler:
- bnc#864299: libpoppler-devel includes poppler-cpp.pc and libpoppler-cpp.so (symlink to libpoppler-cpp.so.*). So libpoppler-devel must require libpoppler-cpp.

Fixed bugs
bnc#864299
libpoppler-devel: missing runtime dependency
Selected Binaries
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