cmake: Replace exec_program() with execute_process() #16779
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The
exec_program()
is deprecated as of CMake 3.0.This also removes the
rm_out
variable as it isn't used in the output. Inexecute_process()
theERROR_QUIET
andOUTPUT_QUIET
resemble the behavior ofexec_program(OUTPUT_VARIABLE)
behavior in this case.