[PATCH][RFC] add inhibit_libc guards to linux-unwind.h for alpha, pa, sh so gcc will build with inhibit_libc set

[Steve Kenton]

The unwind support in linux-unwind.h for the alpha, pa, and sh targets 
causes build errors for cross-compilers due to missing headers when 
inhibit_libc is set.  It looks like they need the same ifndef 
inhibit_libc ... endif guards that  are currently used by i386 and mips. 
As was pointed out to me, some targets such as powerpc don't have this 
problem or need the guards so the test should not be centralized like I 
tried in an earlier patch.  This allows a configuration without-headers 
and without-sysroot which sets inhibit_libc automatically for 
cross-compilers to successfully build languages=c for these targets.  It 
should be trivial to remove this check if the unwind stuff gets copied 
from glibc or someone sorts out the headers so there is no problem, ala 
powerpc, but in the mean time this gets cross compilers building for 
people who want to test linux kernels or build a libc.  I figure if it 
is good enough for i386 it is probably a fairly well accepted trick.

How does this look?  Can this be done as one patch, or should it be 
split into pieces for each target?

Steve
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