[Bug target/108521] New: doc/invoke.texi contains remnants of Cygwin options removed in 2010-10-07

[Brian.Inglis at SystematicSw dot ab.ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108521

            Bug ID: 108521
           Summary: doc/invoke.texi contains remnants of Cygwin options
                    removed in 2010-10-07
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Brian.Inglis at SystematicSw dot ab.ca
  Target Milestone: ---

We are still getting questions about the `--no-/cygwin` options removed on
*2010-10-07* because a remnant still appears under the *x86 Windows options*
summary in gcc/doc/invoke.texi line 1476 in master.
Attached patch removes the remnant to kill this for good; also submitted to
gcc-patches from home email.