Log Message:
Import gmime20-2.2.25 as mail/gmime20.
based on mail/gmime before updated to incompatible 2.6, with patches for new
glib2 borrowed by mail/gmime24.

approved by wiz@ dureing freeze.

GMime is a set of utilities for parsing and creating messages using the
Multipurpose Internet Mail Extension (MIME) as defined by the following RFCs:
 * 0822: Standard for the Format of Arpa Internet Text Messages
 * 1521: MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for
         Specifying and Describing the Format of Internet Message Bodies
 * 1847: Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted
 * 1864: The Content-MD5 Header Field (Obsoletes rfc1544)
 * 2015: MIME Security with Pretty Good Privacy (PGP)
 * 2045: Multipurpose Internet Mail Extensions (MIME) Part One:
         Format of Internet Message Bodies
 * 2046: Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
 * 2047: Multipurpose Internet Mail Extensions (MIME) Part Three:
         Message Header Extensions for Non-ASCII Text
 * 2048: Multipurpose Internet Mail Extensions (MIME) Part Four:
         Registration Procedures
 * 2049: Multipurpose Internet Mail Extensions (MIME) Part Five:
         Conformance Criteria and Examples
 * 2183: Communicating Presentation Information in Internet Messages:
         The Content-Disposition Header Field
 * 2184: MIME Parameter Value and Encoded Word Extensions: Character
         Sets, Languages, and Continuations
 * 2231: MIME Parameter Value and Encoded Word Extensions: Character
         Sets, Languages, and Continuations (Obsoletes rfc2184)
 * 3156: MIME Security with OpenPGP (Updates rfc2015)