avutil/csp: Improve enum range comparisons

The underlying integer type of an enumeration is
implementation-defined (see C11, 6.7.2.2 (4)); GCC defaults
to unsigned if there are no negative values like for all enums
from pixfmt.h except enum AVPixelFormat.

This means that tests like "if (csp >= AVCOL_SPC_NB)" for
invalid colorspaces need not work as expected (namely if
enum AVColorSpace is signed). It also means that testing
for such an enum variable to be >= 0 may be tautologically
true. Clang emits a -Wtautological-unsigned-enum-zero-compare
warning for this.

Fix both of these issues by casting to unsigned.
Also do the same in libswscale/format.c.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

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