ccan/cppmagic: Add CPPMAGIC_INC(x) macro
ccan/cppmagic: Add CPPMAGIC_INC(x) macro

The original ccan module does not include a macro to increment numbers. Add one
which will increment upto 32 which is enough for our usage.

Signed-off-by: Alistair Popple <e9adbcf81c8a36ccc628e09bc92d0e25e1c8e501@popple.id.au>

open-power/pdbg,open-power/pdbg,open-power/pdbg