Handle CT error macros separately

Handle CT error macros separately

Because the default error macro generator assumes the header file with
error macros is in include/openssl and therefore generates a C file
with error texts that include <openssl/{name}.h>, we need to generate
the error macros and texts for CT separately, since the CT module
doesn't follow the default criteria.

Reviewed-by: Matt Caswell <matt@openssl.org>