[arm] libfuncs1 arch detection

[Paul Brook]

If arm/lib1funcs.asm is compiled with a compiler/architecture it doesn't 
recognise, the resulting code probably won't work as desired.

The attached patch catches this error at build time.

Tested with cross to arm-none-eabi.
Applied to mainline and csl-arm-branch.

Paul

2005-08-12  Paul Brook  <paul@codesourcery.com>

	* config/arm/lib1funcs.asm: Error if __ARM_ARCH__ not set.

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