meta-toolchain: keep various /usr/share folders
meta-toolchain: keep various /usr/share folders

Do not delete /usr/share folders for individual toolchains.
(In order to preserve /usr/share/gdb.)

Change-Id: I224eb036183d450ee4713f0bd9c84dbd6f1e3ca7
Signed-off-by: Juro Bystricky <632519cd04f15aec8742590453c2132c1299a8ac@intel.com>

zephyrproject-rtos/meta-zephyr-sdk,zephyrproject-rtos/meta-zephyr-sdk,zephyrproject-rtos/meta-zephyr-sdk,zephyrproject-rtos/meta-zephyr-sdk