perf tools: Move path related functions to util/path.h

Disentangling util.h header mess a bit more.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-aj6je8ly377i4upedmjzdsq6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/dso.c

@@ -3,6 +3,7 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <errno.h>
+#include "path.h"
 #include "symbol.h"
 #include "dso.h"
 #include "machine.h"