[gmime] Try autoconf 2.54 instead of 2.69?

[Jeffrey Stedfast <fejj src gnome org>]

commit 70dc7c3705eec8e6d8d7b276bfffed1d1890ccdf
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Fri Mar 3 09:56:04 2017 -0500

    Try autoconf 2.54 instead of 2.69?

 .travis.yml  |    2 +-
 configure.ac |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index f452939..90f67c2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,6 @@ before_install:
   - sudo apt-get -qq update
   - sudo apt-get install -y automake gtk-doc-tools gnome-doc-utils libgpgme11 libgpgme11-dev gpgsm
 script:
-  - automake --version
+  - autoconf --version
   - ./autogen.sh
   - ./configure --disable-mono && make && make check
diff --git a/configure.ac b/configure.ac
index d0c8a31..cfe1a28 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # Process this file with autoconf to produce a configure script.
-# require autoconf 2.69
-AC_PREREQ(2.69)
+# require autoconf 2.54
+AC_PREREQ(2.54)
 
 # Making releases:
 #   gmime_micro_version += 1;