gcc: Drop stdlib++ option patch

The patch to gcc to disable use of libstdc++ when configuring the library
during gcc-runtime is old and there are perhaps better ways to do this now.

If removed, most builds still "work" but incorrect values for things like
atomic ops are found during configure. mips64 and ppc fail with on target
simple tests of g++ in testimage.

Instead we can create a dummy libstdc++ which allows the correct configure
test results to be obtained.

Discussed with upstream about the patch are ongoing, if accepted, we can
switch back to the commandline option if it is added in future.

(From OE-Core rev: 34b0edb0d3120c32063ff7e3dd52be20d60401d5)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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