configure.ac:
* add --enable-all-osp to separate OSP meta-feature sets from --enable-all, allowing --enable-all --disable-all-osp --disable-opensslall (e.g. for testing OPENSSL_COEXIST).
* fix enable_all_crypto=yes in enable-all to be conditional on "$enable_all_crypto" = "".
* move enable_rsapss=yes from enable-all to enable-all-crypto.
examples/ and testsuite/: #undef OPENSSL_COEXIST unconditionally rather than only if defined(OPENSSL_EXTRA), to capture -DOPENSSL_EXTRA_X509_SMALL or any other such variants.
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