clang-format: adjust penalty for return type line break

The penalty of 5 makes clang-format very eager to put even short type
declarations (e.g. "extern int") into a separate line, even when
breaking parameters list is sufficient.

Signed-off-by: Patryk Obara <patryk.obara@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.clang-format

@@ -163,7 +163,7 @@ PenaltyBreakComment: 10
 PenaltyBreakFirstLessLess: 0
 PenaltyBreakString: 10
 PenaltyExcessCharacter: 100
-PenaltyReturnTypeOnItsOwnLine: 5
+PenaltyReturnTypeOnItsOwnLine: 60
 
 # Don't sort #include's
 SortIncludes: false