clang-format: space after cast and sizeof for GNU coding style

Hello,
    I've noticed -style=gnu does not place single space after casts as can be seen in: http://www.gnu.org/prep/standards/standards.html
if you find: "if ((foo = (char *) malloc (sizeof *foo)) == 0)"

What do you think about that? Maybe, similar behavior should be followed for 'static_cast<struct *>' and 'sizeof', where the spaces are missing too?

Thank you,
Martin

http://llvm.org/PR19982.