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Forgot to declare CMAKE_ARGS ahead of time to prevent unboud variable errors;

Authored by Conanap on Apr 8 2021, 7:14 AM.

Description

Forgot to declare CMAKE_ARGS ahead of time to prevent unboud variable errors;
I noticed a ccache: command not found error in the process and this fixes
that too by checking the utility is available before running it.

Differential revision: https://reviews.llvm.org/D99097