[ECOS] ARM EABI port / static constructor priority removal

["Chris Zimman" <czimman@bloomberg.com>]

I have a nearly working port of eCos for the Broadcom BCM5890 that also
includes ARM EABI (arm-none-eabi-gcc) support.  The idea is that people
should be able to build eCos with a supported toolchain (aka CodeSourcery)
(and perhaps at some point ADS).  Redboot builds and runs fine under EABI now
(at least on this target, but I suspect it will be OK on other ARM targets as
well).

One of the things that's holding it up is the use of
__attribute__(init_priority(_pri_))) because there appears to be an issue (I
hesitate to call this a bug until it's further understood) where 'ld -r'
combines __init_array entry ordering when creating extras.o  When you link
the resulting target images, the static constructor ordering gets messed up a
little bit, and of consequently things don't work right.

Anyhow -- one of the possible solutions that came out of this was to remove
the requirement for multiple translation unit static constructor ordering.
It's a GNU only extension and generally not considered good behavior.

It's a big change, but that by itself is not a good reason not to do it.  Any
thoughts?

BTW, this ARM tree has a lot of general improvements.  It includes support
for ARM processors that don't have the vector tables at 0x0, has a bunch of
additional ARM9 helper routines, low power sleep in the idle loop, etc.

--Chris

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