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Provide more advice for building client software - Redmine #3279

The gromacs-toolchain${GMX_LIBS_SUFFIX}.cmake file installed by InstallLibInfo.cmake is not documented or mentioned in warning messages. For instance, gromacs-config.cmake defines gromacs_check_compiler() to help client code identify a compatible toolchain, but only gives the value of {GROMACS\_{LANG}_COMPILER}. The CMake toolchain file was introduced to help client software initialize CMake with appropriate compilers (or compiler wrappers), but GMXTOOLCHAINDIR and -DCMAKE_TOOLCHAIN_FILE do not appear in any documentation.

As part of resolving this issue, we may want to evaluate whether a CMake toolchain file is the correct and only solution. An alternative may be a packaged subset of CMake cache variables to be loaded with “-C”.

Note that we may want to distinguish between an MPI compiler wrapper and the wrapped compiler, which the generated toolchain file does not currently do.

(from redmine: issue id 3279, created on 2020-01-02 by eirrgang)