[mod_secdownload] warn if SHA used w/o SSL crypto
[mod_secdownload] warn if SHA used w/o SSL crypto

issue warning at startup, instead of fatal error, if SHA used in
secdownload.algorithm = "..." but mod_secdownload was built without
SSL crypto.  When lighttpd is built without openssl, this allows most
tests/* to be run and pass, except the ones in tests/mod-secdownload.t
which use "hmac-sha1" or "hmac-sha256".

(alternatively, could have made, used isolated tests/secdownload.conf)

lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,PatchyFog/lighttpd1.4-mbedtls,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,PatchyFog/lighttpd1.4-mbedtls,PatchyFog/lighttpd1.4-mbedtls,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,PatchyFog/lighttpd1.4-mbedtls,PatchyFog/lighttpd1.4-mbedtls,PatchyFog/lighttpd1.4-mbedtls,PatchyFog/lighttpd1.4-mbedtls