Fix the following build failure raised since bump of autoconf to version
2.71 in commit ecd54b65c1:
configure: error: could not determine the string function for int64_t
Fixes:
- http://autobuild.buildroot.org/results/640bbe5b19d6e046cebd5208b37293e03714cd21
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
