[ORC-RT] Disable ORC Runtime on ccache builders.
The ORC runtime contains assembly files that don't seem to build correctly
under ccache (e.g. https://lab.llvm.org/buildbot/#/builders/109/builds/18980).
This commit disables the ORC runtime on those builders, which seems to be the
same fix that was adopted for XRay and other compiler-rt libraries that use
Differential Revision: https://reviews.llvm.org/D106425