[PATCH] configure.ac: fix automake warnings reported with recent automake updates:

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

automake: warnings are treated as errors
/usr/share/automake-1.13/am/ltlibrary.am: warning: 'libfwtsacpica.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.13/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index 77d44bf..477c008 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,6 +2,7 @@
           AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 	  AC_CANONICAL_HOST
 	  AC_CONFIG_MACRO_DIR([m4])
+	  AM_PROG_AR
           AC_PROG_CC
 	  AC_PROG_LEX
 	  AC_PROG_YACC
-- 
1.8.1.2