[R-package] Improve portability of OpenMP checks in R-package configure on macOS

[StrikerRUS]

Originally discussed in #4507 (comment).

Right now, configure.ac checks compilation on macOS with -Xclang -fopenmp OpenMP flags. In case of failure, it tries to compile one more time with default -fopenmp flag. I think we can improve that check by trying to compile with some other OpenMP flags with the aim to support more compilers.

LightGBM/R-package/configure.ac

Line 103 in c65a2e3

if test `uname -s` = "Darwin"

Possible flags to check: https://github.com/autoconf-archive/autoconf-archive/blob/6c25681d78d963708362ea0d4d63ee9b508782b6/m4/ax_openmp.m4#L82.

[StrikerRUS]

Closing in favor of being in #2302. We decided to keep all feature requests in one place.

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