[ptx] hugin, nona, enblend on amd64

[Pablo d'Angelo]

Hi!

Since I own an Athlon64 3Ghz, and I have only used it in 32 bit mode so far,
I installed Suse Linux 9.1 for AMD64, compiled all needed stuff with gcc 3.3
for amd64 and ran two tests.

Compilation:
1. wxwindows 2.4.2 worked fine (compiled from source)
2. boost       (fine, supplied by suse)
3. panotools   (needed to add -fPIC to the compiler flags)
4. hugin & nona (needed a few minor changes, which I will checkin later)
5. enblend    (worked fine)


I used nona to remap a 24 image pano ( 11152 x 5483) to multiple tiff and
enblend to blend it. here are the times, for both Suse 9.1 (AMD64) and
debian unstable (i386, also gcc 3.3).

           AMD64               i386
nona
 real    7m22.307s          8m13.001s
 user    6m52.438s          7m56.454s
 sys     0m7.081s           0m8.480s

enblend
 real    17m19.074s          21m22.067s
 user    6m59.866s           7m17.790s
 sys     1m36.806s           0m58.766s

I was quite surprised to see such a huge difference in the "user" time,
for nona, thats roughly 15% faster.

The enblend benchmark is a lot less significant, since most of the time
is spend writing to disk. the "user" difference is also only 18 seconds
here.

ciao
  Pablo