[Pixman] warnings in pixman 0.21.4

[Rolland Dudemaine]

Hi,

Attached is a diff that resolves a number of warnings I encountered when
porting pixman over to my RTOS.
Most examples compile cleanly now.
I had to move the definitions of PIXMAN_null, PIXMAN_any and related so
they become type-safe, otherwise my compiler gives a enumeration to int
cast warning. It is cleaner that way anyway.

--Rolland

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