3.2.12

• Fixed a memory leak in g_mime_gpgme_get_decrypt_result().
• Updated vapigen.m4, introspection.m4, and gpgme.m4 to improve cross-platform builds.
• Add and use ax_lib_socket_nsl.m4 so that systems that do not require linkage with libnsl
  are not forced to link with it unnecessesarily.
• Changed the build system to no longer use dolt (which is obsolete).