[Bug c/65231] Dead link in man page to the status of C99 features

[humbug at deeptown dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65231

Roman Proskuryakov <humbug at deeptown dot org> changed:

           What    |Removed                     |Added
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           Keywords|                            |documentation
           Severity|normal                      |trivial