perf build failure in v6.1.53-221-g5e5c3289d389

[Guenter Roeck <linux@xxxxxxxxxxxx>]

make tools/perf fails with

gcc: fatal error: no input files

Bisect points to 'perf build: Update build rule for generated files'
which adds

+
+# pmu-events.c file is generated in the OUTPUT directory so it needs a
+# separate rule to depend on it properly
+$(OUTPUT)pmu-events/pmu-events.o: $(PMU_EVENTS_C)
+       $(call rule_mkdir)
+       $(call if_changed_dep,cc_o_c)

but there is no PMU_EVENTS_C in v6.1.y.

Guenter