Remove support for libcrypto w/out ECC.

Since 2010, we have supported building against an OpenSSL that did not
have any ECC support, since at the time many systems still shipped with
OpenSSL versions prior to ECC being added.  We no longer support OpenSSL
versions that old, and while it's possible to build a modern libcrypto
without ECC, doing so seems very uncommon.

Having OPENSSL_HAS_ECC sprinkled throughout the code increases the
cost of syncing changes and is a maintenance burden, so this has now
outlived its usefulness and is being removed.  It is still possible to
build --without-openssl on such systems if required.

This includes a few whitespace and header order changes to bring
Portable back into sync with OpenBSD in those places, and removes the
corresponding test.

ok djm@

.github/workflows/c-cpp.yml

@@ -86,7 +86,6 @@ jobs:
           - { target: ubuntu-latest, config: libressl-4.2.0 }
           - { target: ubuntu-latest, config: libressl-4.3.2 }
           - { target: ubuntu-latest, config: openssl-master }
-          - { target: ubuntu-latest, config: openssl-noec }
           - { target: ubuntu-latest, config: openssl-1.1.1 }
           - { target: ubuntu-latest, config: openssl-1.1.1t }
           - { target: ubuntu-latest, config: openssl-1.1.1w }