r5108 FTBFS without HAVE_LIBREADLINE

[Peter Palfrader]

Hi,

card-util.c: In function 'card_edit':
card-util.c:1819: error: 'card_edit_completion' undeclared (first use in this function)
card-util.c:1819: error: (Each undeclared identifier is reported only once
card-util.c:1819: error: for each function it appears in.)

card_edit_completion is only defined conditionally on HAVE_LIBREADLINE,
but it's used unconditionally.

Cheers,
Peter
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