Revert "perf report: Add warning when libunwind not compiled in"

This reverts commit 59b706ce.

This change depends on more changes that didn't exist in 4.9 and older.
Signed-off-by: Sasha Levin <sashal@kernel.org>

tools/perf/builtin-report.c

@@ -292,13 +292,6 @@ static int report__setup_sample_type(struct report *rep)
 				PERF_SAMPLE_BRANCH_ANY))
 		rep->nonany_branch_mode = true;
 
-#ifndef HAVE_LIBUNWIND_SUPPORT
-	if (dwarf_callchain_users) {
-		ui__warning("Please install libunwind development packages "
-			    "during the perf build.\n");
-	}
-#endif
-
 	return 0;
 }