[Patch] Fix to LFS support detection

[Paolo Carlini]

Hi,

as already discussed, with recent glibc/binutils (honestly I didn't
investigate further) the current autoconf test for LFS may fail at
link time like this:

    undefined reference to `__gxx_personality_v0'

Seems safe to add in general '-fno-exceptions' to the test.

Tested x86-linux. Will commit soon if nobody objects.

I mean to add to the testsuite something for LFS, which, however,
shall be run only on platforms LFS-enabled.

Paolo.

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