support AMD AOCC compiler

AMD;'s new compiler currently is not supported in the ET since, the known-architecture file aborts if it cannot identify the compiler (even when CC and CFLAGS etc are all being provided).

See http://lists.einsteintoolkit.org/pipermail/users/2021-August/008157.html

AMD’s compiler suite has its own C compiler and Fortran compiler either forked off from the PGI compiler (old and current version) or flang (current and future version).

Right now it is unclear if it would offer a performance benefit over GNU or Intel compilers.

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