configure.ac: Use new name for `AX_C_LONG_LONG'.

The correct name is in wheezy's version of the Autoconf archive, so I
guess it's not that new really.

diff --git a/configure.ac b/configure.ac
index 86f7944ab51d79f7889d49f2c2378af0442c0b2a..8b6ca53da98fe25e4af4dd23fa19002c89f01fe0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -231,7 +231,7 @@ LIBS=$mdw_ORIG_LIBS
 dnl Find out whether very long integer types are available.
 AC_CHECK_HEADERS([stdint.h])
 AC_SUBST([have_stdint_h])
-AC_C_LONG_LONG
+AX_C_LONG_LONG
 
 dnl Some equipment wanted for checking CPU features at runtime.
 AC_CHECK_HEADERS([asm/hwcap.h])