sysroot: change symlink path from absolute to relative
sysroot: change symlink path from absolute to relative

This patch changes symbolic link in sysroot with absolute path
into relative path. The absolute path in sysroot is wrong because
it indicates host files. This patch fixes it.

Change-Id: If942e3fa538838df32ae03887f13df91a67cacc7
Signed-off-by: Sowon Na <7ed402a04f2fdc9693a203092231aea9e041664b@samsung.com>

SamsungARTIK/build-artik