This macro retrieves the compiler version and returns it in the cache variable $ax_cv_c_compiler_version for C and $ax_cv_cxx_compiler_version for C++.
Version is returned as epoch:major.minor.patchversion
Epoch is used in order to have an increasing version number in case of marketing change.
Epoch use: * borland compiler use chronologically 0turboc for turboc era,
1borlanc BORLANDC++ before 5, 2cppbuilder for cppbuilder era, 3borlancpp for return of BORLANDC++ (after version 5.5), 4cppbuilder for cppbuilder with year version, and 5xe for XE era.
An empty string is returned otherwise.
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