(c-beginning-of-statement-1): When checking for bare semi, don't match

(c-beginning-of-statement-1): When checking for bare semi, don't match
on a semi following a close brace.

(c-guess-basic-syntax): CASE 5I: When adding 'inclass syntax, use the
relpos pointing to the class opening brace, unless that hangs on the
right side, in which case, use the start of the class/struct keyword.