[PATCH] Only report hkps scheme when available

[Kristian Fiskerstrand]

Only report support for the hkps scheme when GnuPG / dirmngr
has been built with a TLS library.

--
This helps debuging and enable the user to detect whether support
for hkps is included by doing a
`gpg-connect-agent --dirmngr 'keyserver --help' /bye`.
Currently hkps will be listed as a supported scheme but trying to
add a keyserver using it will silently fail.

As a digression, https is never listed as a valid scheme.

-- 
----------------------------
Kristian Fiskerstrand
Blog: http://blog.sumptuouscapital.com
Twitter: @krifisk
----------------------------
Public OpenPGP key 0xE3EDFAE3 at hkp://pool.sks-keyservers.net
fpr:94CB AFDD 3034 5109 5618 35AA 0B7F 8B60 E3ED FAE3
----------------------------
Ne nuntium necare
Don't kill the messenger
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