scripts: do not chmod u+w the whole source directory

Doing a chmod on the whole source dir after every packages
are extracted can take a hell of a lot of time.

The offending packages are far from legion, and they now
have their own chmod u+w to cleanup their own mess...

Reported-by: ANDY KENNEDY <ANDY.KENNEDY@adtran.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

source "config/backend.in"

source "config/global.in"

source "config/target.in"

source "config/toolchain.in"

source "config/kernel.in"

source "config/binutils.in"

source "config/cc.in"

source "config/libc.in"

source "config/debug.in"

source "config/companion_libs.in"

source "config/companion_tools.in"

source "config/test_suite.in"