Bug#760701: "make check" has runaway memory usage on arm64

[Steve McIntyre <steve@einval.com>]

Package: 3dldf
Version: 2.0.3+dfsg-2
Severity: important

This might be related to #759696, not sure.

On arm64, I just killed the build of 3dldf when I saw that a test
process using 48GB of memory. The build log around this said:

V2:
>> point: (4.679370, 0.000000, 0.506930)
FIG:
>> 18
V2:
>> point: (4.675528, 0.000000, 0.531316)
FIG:
>> 19
V2:
>> point: (4.671684, 0.000000, 0.555702)
FIG:
>> 20
V2:
>> point: (4.667841, 0.000000, 0.580088)
FIG:
>> 21
V2:
>> point: (4.663999, 0.000000, 0.604475)
./runit: line 76:  1464 Killed                  ./3dldf sample2.ldf
make[3]: *** [sample2.mp] Error 137
Makefile:1664: recipe for target 'sample2.mp' failed

-- System Information:
Debian Release: 7.6
  APT prefers stable
  APT policy: (500, 'stable')
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