[ccache] Compiler warnings in ccache 3.2.3

[Tom Lane]

I got a few warnings about assignments of pointers to "bool" values.
I think these are legitimate gripes, because on platforms where bool
is only a byte wide, the net effect will be to assign the pointer's
low-order byte to the bool.  There's at least a 1-in-256 chance of
a non-null pointer erroneously converting to a "false" boolean value
(maybe more than that, if the pointer is likely to be aligned ...).

I propose the attached patches to fix this.

			regards, tom lane

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