eglibc: enforce use of autoconf-2.69

Since we updated autoconf in r42855 we also need to enforce its use
while building eglibc to allow it to build successfully.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 43352

toolchain/eglibc/patches/2.19/300-require-autoconf-2.69.patch

@@ -0,0 +1,13 @@
+Index: eglibc-2.19-r25243/libc/aclocal.m4
+===================================================================
+--- eglibc-2.19-r25243.orig/libc/aclocal.m4	2013-11-06 15:03:08.000000000 -0800
++++ eglibc-2.19-r25243/libc/aclocal.m4	2014-11-22 15:43:05.343256863 -0800
+@@ -1,7 +1,7 @@
+ dnl We require that everyone use exactly the same Autoconf version so that
+ dnl the internal functions defined and used by the main configure script
+ dnl match those expected by the fragments.
+-m4_define([GLIBC_AUTOCONF_VERSION], [2.68])
++m4_define([GLIBC_AUTOCONF_VERSION], [2.69])
+ m4_if(m4_defn([AC_AUTOCONF_VERSION]), GLIBC_AUTOCONF_VERSION, [],
+       [m4_fatal(m4_flatten(
+ Exactly version GLIBC_AUTOCONF_VERSION of Autoconf is required but you have