perf tools: Remove unused machines__find_host()

machines__find_host() does not exist. Remove declaration.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20220513084459.6581-1-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/machine.h

@@ -162,7 +162,6 @@ void machines__process_guests(struct machines *machines,
 
 struct machine *machines__add(struct machines *machines, pid_t pid,
 			      const char *root_dir);
-struct machine *machines__find_host(struct machines *machines);
 struct machine *machines__find(struct machines *machines, pid_t pid);
 struct machine *machines__findnew(struct machines *machines, pid_t pid);
 struct machine *machines__find_guest(struct machines *machines, pid_t pid);