config/override.m4: don't require exactly autoconf 2.69

Fixes #71
Fixes #74

Author: ianlancetaylor

config/override.m4

@@ -43,9 +43,10 @@ AC_DEFUN([_GCC_AUTOCONF_VERSION_CHECK],
   m4_defn([m4_PACKAGE_VERSION]), [],
   [m4_fatal([Please use exactly Autoconf ]_GCC_AUTOCONF_VERSION[ instead of ]m4_defn([m4_PACKAGE_VERSION])[.])])
 ])
-m4_define([AC_INIT], m4_defn([AC_INIT])[
-_GCC_AUTOCONF_VERSION_CHECK
-])
+dnl don't do this for libbacktrace
+dnl m4_define([AC_INIT], m4_defn([AC_INIT])[
+dnl _GCC_AUTOCONF_VERSION_CHECK
+dnl ])
 
 
 dnl Ensure we do not use a buggy M4.

configure

@@ -2295,9 +2295,6 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-
-
-
 ac_config_headers="$ac_config_headers config.h"
 
 
@@ -11281,7 +11278,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11284 "configure"
+#line 11281 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11387,7 +11384,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11390 "configure"
+#line 11387 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H