Illegal instruction on power4+

[Rafael Ávila de Espíndola]

I am trying to use libgcrypt in a p615 but it is trying to use powerpc 
assembly code which causes it to fail with a "Illegal instruction".

In /proc/cpu there is:
--------------------------------------
processor       : 0
cpu             : POWER4+ (gq)
clock           : 1452.000000MHz
revision        : 2.1
----------------------------------------
and the target is powerpc64-unknown-linux-gnu.

I don't know why the powerpc code is not working in this processor, but moving 
the "powerpc64*-*-* " before "powerpc*-*-linux*" in config,links makes 
libgcrypt use generic c implementations and solves the problem. In fact, it 
is useless to have  "powerpc64*-*-* " after  "powerpc*-*-linux*" since every 
powerpc64 linux target would match the first.

Rafael