Here's a stab at a consolidation of the SSL detection heuristics into
configure. Source files aren't changed by this patch, except for setup.h
and the various config*.h files. Within the configure script, OPENSSL_ENABLED
is used to determine if SSL is being used or not, and outside configure,
USE_SSLEAY means the same thing; this could be even further unified some day.

Now, when SSL is not detected, configure skips the various checks that are
dependent on SSL, speeding up the configure process and avoiding
complications with cross compiles. I also updated all the architecture-
specific config files I could see, but I couldn't test them.

While I was at it, I also added an experimental libcurl.pc file to be used
by pkg-config in the same way as curl-config. It's only generated now, it's
not actually installed anywhere.

>>> Dan

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