scripts: do not provide to-sysroot include symlink
Do not provide the PREFIX/TUPLE/include -> SYSROOT/usr/include symlink,
and let gcc install its dependable C++ headers were it sees fit to
install them.
See the test by Anthony (by the end of the messages):
http://sourceware.org/ml/crossgcc/2010-10/msg00129.html
http://sourceware.org/ml/crossgcc/2010-10/msg00134.html
See also the comment by Arnaud:
http://sourceware.org/ml/crossgcc/2010-10/msg00157.html
Reported-by: Anthony Foiani <anthony.foiani@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>