[oe] iwwmmxt optimization and soft float in OE on PXA270

[Koen Kooi]

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Stanislav Brabec schreef:

| It should be the best possible optimization for PXA270 (compiled for
| iwmmxt, use soft float instead of exception based kernel driver, use -Os
| to make binaries as small as possible and add optimizations from -O3).

Angstrom already enables softfloat (for FPU-less systems) and -Os by
default *and* enables iwmmxt (if you have MACHINE_FEATURES = "iwmmxt")
for apps which have been proven to benefit from iwmmxt (e.g. mplayer).

I still get mysterious segfaults when running an all iwmmxt glibc system
(uclibc is even worse), so I don't think flipping the global switch is a
good idea.

regards,

Koen

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