For hx509.texi, we need the copyright macros for both html and info.
Just remove the "ifhtml" conditionals.
For whatis.texi, texinfo 5.1 inserts the sub{} macro inline with no
newlines, so there are errors about @html not being at the end of a
line, etc.
@def@copyrightstart{}
@def@copyrightend{}
@end iftex
-@ifinfo
@macro copynext
@end macro
@macro copyrightstart
@end macro
@macro copyrightend
@end macro
-@end ifinfo
@page
@copyrightstart
@ifhtml
@macro sub{arg}
+
@html
<sub>\arg\</sub>
@end html
+
@end macro
@end ifhtml