Fix encoding for some inline pgp mails
* src/mail.cpp (Mail::update_body): Use InternetCodepage if charset is not set by the parser. * src/mlang-charset.cpp (ansi_charset_to_utf8): Add handling for a directly provided codepage. * src/rfc2047parse.c (rfc2047_decode_tokens): Update caller.
For PGP Inline the charset is not detected by the parsecontroller
in that case we now just use the InternetCodepage from OOM.
Tests show that this works properly.
- GnuPG-Bug-Id: T3962