Check for symbol length in character.1.body
Cmucl converts a string to Unicode NFC form before creating a symbol. This means some symbols have names that longer than 1 character. The test assumes the name has one character which causes an error in cmucl. This just adds a check that the length is 1 before extracting the character from the symbol name. This doesn't change behavior of the test (which was already assuming a length of 1), but allows cmucl not to signal an error but to finish the test with a meaningful list of characters whose corresponding symbol name is more than one character long. A couple of minor tweaks: - Ignore sse2f fasl created by cmucl/x86. - Add comment to makefile on how to run with cmucl.