helptags doesn't extract multi-byte tags if encoding=cp932

[mattn]

Hi.

helptags_one extract help tag like '*foo*'. it's used vim_strchr() to find second '*'. But vim_strchr() depend on current &encoding. Help file should be latin-1 or utf-8 encoding. So if DBCS is used for &encoding, it may not extract second '*'.
Below is a patch. Please check and include.

https://gist.github.com/2656714

- Yasuhiro Matsumoto

[Bram Moolenaar]

Thanks, I'll look into it soon.

--
An SQL statement walks into a bar. He approaches two tables
and says, "Mind if I join you?"

/// Bram Moolenaar -- Br...@Moolenaar.net -- http://www.Moolenaar.net \\\
/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\ an exciting new programming language -- http://www.Zimbu.org ///
\\\ help me help AIDS victims -- http://ICCF-Holland.org ///