help doesn't buttonize some functions

[Emanuel Berg]

Eval this:

(defun test-fun ()
  "`equal' isn't the same as `='. `+' doesn't work either." )

Then do

  C-h f test-fun RET

and observe that while `equal' is a button, neither of `=' or
`+' is.

It is the same from C, see for example

  C-h f eql RET

where `eq' and `eql' are buttonized, `=' isn't.

eql is defined in src/fns.c

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