Properly convert from ranlib to lt_init in configure.ac
diff --git a/configure.ac b/configure.ac
index eceeb02..9d0c2c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,7 +50,7 @@ AC_PROG_CC
gl_EARLY
AC_PROG_GCC_TRADITIONAL
AM_PROG_CC_C_O
-AC_PROG_RANLIB
+LT_INIT([disable-shared])
gl_INIT