[lapack] Use generic macro to detect 64 bit platforms

[Panu Matilainen]

On 10/14/2014 10:14 PM, Jerry James wrote:
> On Tue, Oct 14, 2014 at 4:57 AM, Panu Matilainen
> <pmatilai at laiskiainen.org> wrote:
>> [1] says no such thing, the isa macros are defined for all architectures
>> except obviously noarch. Perhaps you're misinterpreting the example on 64bit
>> package requiring a 32bit package which warns that not all 64bit
>> architectures multiarch.
>
> Ah, probably so.  I think I was already prejudiced in that direction
> by seeing messages like this one:
> https://lists.fedoraproject.org/pipermail/scm-commits/Week-of-Mon-20140317/1209708.html.

That would be an issue with koji, there's at least these two bugs on it:
https://bugzilla.redhat.com/show_bug.cgi?id=1141513
https://bugzilla.redhat.com/show_bug.cgi?id=1096480

There is no such architecture as "arm" defined in rpm, so obviously 
arch-specific macros such as the isa-stuff is not defined for it.

	- Panu -