[gmime] Created tag 2.6.20

[Jeffrey Stedfast <fejj src gnome org>]

The unsigned tag '2.6.20' was created.

Tagger: Jeffrey Stedfast <jestedfa microsoft com>
Date: Tue Feb 7 12:15:10 2017 -0500

    Tagged for 2.6.20

Changes since the last tag '2.6.19':

Colin Walters (3):
      autogen.sh: Honor NOCONFIGURE=1
      build: Use m4_ifdef for GPGME support
      build: Do srcdir != builddir from git

Jeffrey Stedfast (8):
      Don't write out extra spaces in the References header
      Added warning to g_mime_crypto_context_decrypt() about a possible DoS
      Fixed a memory leak in g_mime_object_set_content_disposition_parameter
      Fixed logic bug when removing a non-existent header
      Improved performance using SIMD in gmime-parser.c
      updated copyrights
      updated copyrights
      Bumped version to 2.6.20