include/CMakeLists.txt: error out when architecture is not supported #1070
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Since commit b98c56f ("stop exposing hidden defines in public opensslconf.h"), only a subset of CPU architectures is supported by libressl. However, when a build is attempted for an unsupported architecture, it doesn't fail with a clear error message at configure time, but it fails with a weird error at build time:
crypto/../include/openssl/rc4.h:75:9: error: unknown type name 'RC4_INT'
In order to help users, let's bail out nicely at configure time with a good error message when the CPU architecture is not supported.