clang-format: exclude control macros from SpaceBeforeParens

The formatter currently suggests adding a space between a control macro
and parentheses. In the Git project, this is not typically expected. Set
`SpaceBeforeParens` to `ControlStatementsExceptControlMacros`
accordingly.

Helped-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Justin Tobler <jltobler@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.clang-format

@@ -149,7 +149,7 @@ SpaceBeforeCaseColon: false
 #     f();
 #   }
 # }
-SpaceBeforeParens: ControlStatements
+SpaceBeforeParens: ControlStatementsExceptControlMacros
 
 # Don't insert spaces inside empty '()'
 SpaceInEmptyParentheses: false