Patch: make a configure test more portable

[Kelley Cook <kelleycook at wideopenwest dot com>]

Cygwin is not completing the "linker read-only and
read-write section mixing" configure test. It aborts with:

conftest1.s: Assembler messages:
conftest1.s:1: Warning: rest of line ignored; first ignored
character is `"'

It seems that Cygwin's "as" doesn't like double-quotes
surrounding it's section names.  This in itself may or may
not be a bug, but it that is not what this particular
conftest is testing.  Regardless, from what I can gather
from the gas docs not having the quotes should be OK on all
targets.

So this simple change allows the gcc_cv_ld_ro_rw_mix
configure variable to be properly set on Cygwin.

Patch is against mainline.  Bootstrapped on i686-pc-cygwin.

Kelley Cook [no cvs write access]

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