Consistently add #error when compiling on unsupported architectures. #2450
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#if arch() guard blocks are used for per architecture code paths, so
for unsupported architectures add an #else/#error message to ensure
the correct path is added.
This fixes some initializers that may have otherwise been empty.
Ignore blocks with just one architecture as this is usually a specific
targeted fix.
I think the message is correct for all cases but can be changed if necessary.