tools feature: Rename HAVE_EVENTFD to HAVE_EVENTFD_SUPPORT

To be consistent with other such auto-detected features.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anand K Mistry <amistry@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/bench/epoll-ctl.c

@@ -5,7 +5,7 @@
  * Benchmark the various operations allowed for epoll_ctl(2).
  * The idea is to concurrently stress a single epoll instance
  */
-#ifdef HAVE_EVENTFD
+#ifdef HAVE_EVENTFD_SUPPORT
 /* For the CLR_() macros */
 #include <string.h>
 #include <pthread.h>
@@ -412,4 +412,4 @@ int bench_epoll_ctl(int argc, const char **argv)
 errmem:
 	err(EXIT_FAILURE, "calloc");
 }
-#endif // HAVE_EVENTFD
+#endif // HAVE_EVENTFD_SUPPORT

tools/perf/bench/epoll-wait.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-#ifdef HAVE_EVENTFD
+#ifdef HAVE_EVENTFD_SUPPORT
 /*
  * Copyright (C) 2018 Davidlohr Bueso.
  *
@@ -540,4 +540,4 @@ int bench_epoll_wait(int argc, const char **argv)
 errmem:
 	err(EXIT_FAILURE, "calloc");
 }
-#endif // HAVE_EVENTFD
+#endif // HAVE_EVENTFD_SUPPORT