[PATCH util-macros] Bump minimum Autoconf required version to 2.62

[Gaetan Nadon]

The main motivation is to catch-up with the development reality and
allow use of features in Autoconf 2.62 as well as Automake 1.11.

As usual this means no features found only in versions above those
specified are allowed.

This is implementing the policy change which is described in:
http://www.x.org/wiki/Building_the_X_Window_System/?updated#index2h3

Discussion on xorg minimum autotools requirements:
http://lists.x.org/archives/xorg-devel/2013-October/038325.html

Signed-off-by: Gaetan Nadon <memsize at videotron.ca>
---
 configure.ac |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 6d52b10..a412445 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@ dnl  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 dnl
 dnl Process this file with autoconf to create configure.
 
-AC_PREREQ([2.60])
+AC_PREREQ([2.62])
 AC_INIT([util-macros],
         [1.18.0],
         [https://bugs.freedesktop.org/enter_bug.cgi?product=xorg],
-- 
1.7.9.5