Bug#763805: Atlas needs sane config for arm64

[Steve McIntyre]

Package: src:atlas
Version: 3.10.2-3
Severity: normal

Atlas needs a reasonable base config for arm64 to stop it burning
ridiculous amounts of buildd time for each upload.

Aside: is there really no way to come up with a truly generic config
by asking the compiler? I understand the desire to build things
fully-optimised, but it shouldn't be that hard to make a known-slow
but working config, surely?

-- System Information:
Debian Release: 7.6
  APT prefers stable
  APT policy: (500, 'stable'), (500, 'oldstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash