Using TARGET_OS can add the ABIEXTENSION so ensure that is is removed for the Linux
TARGET_OS, we might have other TARGET_OSes so don't hard code CMAKE_SYSTEM_NAME
[YOCTO #5145]
(From OE-Core rev: 7d8b700242b1b32c6b6d0735b497701800f54fc4)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>