[Fontforge-devel] aarch64 support for autotools

aarch64 is going to arrive later this year, and support for configuring
and building on it landed in autoconf 2.69. Currently fontforge has an
older version of autoconf used.

Graphical flowchart for build environment shown here:
http://en.wikipedia.org/wiki/Autoconf
Merge pull request #481 from JoesCat/2013mar26_aarch64_support

2013mar26 aarch64 support