[R-package] characterize all cmake messages

[jameslamb]

I've noticed in the logs from running Rscript build_r.R that one log message seems misaligned

-- Check for working CXX compiler: /usr/local/clang-7.0.0/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
R version passed into FindLibR.cmake: 3.6.3
-- Found LibR: /usr/lib/R  
-- LIBR_EXECUTABLE: /usr/bin/R
-- LIBR_INCLUDE_DIRS: /usr/share/R/include
-- LIBR_CORE_LIBRARY: /usr/lib/R/lib/libR.so

I looked into it tonight, and this is because the "R version passed into..."message produced inFindLibR.cmakeis not characterized. In other words, it is usingmessage("R version...")instead ofmessage(STATUS "R version...")`.

This PR proposes characterizing this and one other message produced by CMake when building the R package. That line is not special and it shouldn't be drawing any special attention in the log.

[StrikerRUS]

Thanks!

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