meson: fix regression that made it impossible to build
meson: fix regression that made it impossible to build

In commit aa4909766c24c17bd1d9000ca419f6dc6b32c238 an option was
modified and changed its type from a list of possible strings to a
true/false value.

However, the build wasn't updated to correspond to that change, so it
didn't logically work -- and Meson even threw a type error saying you
cannot compare strings to booleans.

The actual change was basically "do not use this option anymore except
to pass a macro to the source file and embed the data at all". So we can
simply get rid of a bunch of complex dependency conditionals.

Fixes #185

rockdaboot/libpsl,rockdaboot/libpsl,rockdaboot/libpsl