make generic INIT_C_CC a bit more generic

turn it into an array initializer; then alpha, mips and powerpc
variants fold into it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/YxDm7M6M91gC2RPL@ZenIV


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>