clang-format: Add space in function pointers with SpaceBeforeParens=Always

"void (*my_function)(void)" should become "void (*my_function) (void)" when
SpaceBeforeParens is set to 'Always'

Differential Revision: http://reviews.llvm.org/D9835



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@237704 91177308-0d34-0410-b5e6-96231b3b80d8