cmake/FindLDAP: avoid empty 'Requires' item when omitting pkg-config module
#15828
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…` module `list(APPEND ...)` does this automatically, but we're _prepending_ LDAP (to follow historical code and also autotools). `list(PREPEND ...)` would likely do that the same, but it requires CMake 3.15 so we do this manually and the manual method needs to skip the empty value manually. Follow-up to 49f2a23 curl#15273
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list(APPEND ...)does this automatically, but we're prepending LDAP(to follow historical code and also autotools).
list(PREPEND ...)would likely do that the same, but it'd require CMake 3.15 so we do this
manually and the manual method needs to skip the empty value manually.
Follow-up to 49f2a23 #15273