cmake: fix the backward compatible toolchain-pc.cmake file
cmake: fix the backward compatible toolchain-pc.cmake file

aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild