stage8: remove legacy PCM-X source family #1181

Job	Run time
Validate (comment headers + format + tidy + commit msg)	1m 18s
Linux --disable-cluster regression	0s
Security (cppcheck + scan-build)	0s
macOS build-only (compile guard)	0s
Linux enable-cluster (unit + regress + smoke TAP)	0s
	1m 18s

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