[patch] fix libffi build on arm-linux-gnueabi with -mfloat-abi=softfp

[Matthias Klose]

Based on the comments in PR41443:

All the references to __SOFTFP__ in this file are incorrect for EABI; the
__SOFTFP__ code should be used for *soft-float ABI* whether or not VFP is
enabled, and __SOFTFP__ does specifically mean soft-float not soft-float
ABI.

If you change the conditionals to __SOFTFP__ || __ARM_EABI__ then
-mfloat-abi=softfp should work.  -mfloat-abi=hard won't; that would need
both a new macro to identify the hard-VFP ABI, and new libffi code to
handle that ABI.

No regressions when running the libffi testsuite with and without 
-mfloat-abi=softfp.

Ok for the trunk, ok for the branches (checking that the macros are available 
there)?

   Matthias
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