crosstool-ng: Pull in libstdc++ header path fix for additional libc

This commit pulls in the crosstool-ng patch that fixes the wrong
libstdc++ C library header path, specified using `--with-headers`
argument, for additional libc variants such as newlib-nano and picolibc.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio