RFA: fix autoconf test for eh_frame handling on cygwin/mingw

[Geoff Keating]

Hi Joern,

> 2006-03-09  Andrew Stubbs <andrew.stubbs@st.com>
> 	    J"orn Rennecke <joern.rennecke@st.com>
>
> 	* configure.ac (.eh_frame data check): Use diff -b.

This patch is OK.  (It would have been faster to review if you'd said  
what effort you'd made to determine how portable 'diff -b' is; I see  
it's part of SUS so that's probably good enough.)

:REVIEWMAIL:

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