Bug#789826: Patch attached

[Mathieu Trudel-Lapierre]

Hi,

Admittedly, this is a rather heavy-handed approach, but changing epsilon
for the Collinear() calls to 1e-3 instead of 1e-4 lets the builds complete
successfully on all architectures, including i386.

This appears to be as being related to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 , in other words, because
the CrossProduct as it is being calculated is probably having values
rounded multiple times.

Attached is a patch that has been applied on Ubuntu to change the epsilon
value used for the Line2 tests.

I think this warrants being brought up to the upstream too, perhaps they
have a preferred way of dealing with this.

Kindly,

Mathieu Trudel-Lapierre <mathieu-tl at ubuntu.com>
Freenode: cyphermox, Jabber: mathieu.tl at gmail.com
4096R/EE018C93 1967 8F7D 03A1 8F38 732E  FF82 C126 33E1 EE01 8C93
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