libksba-1.0.5: nanosleep() unresolved

[Nelson H. F. Beebe]

Builds of libksba-1.0.5 on Sun Solaris systems failed to resolve the
POSIX nanosleep() function at link time.

According to "man nanosleep" on those systems, -lrt (real-time
library) is needed.

Unfortunately, you cannot just supply -lrt by default, since some
systems (e.g., Mac OS X, FreeBSD, NetBSD, OpenBSD) do not have it: a
configure-time test for the library is needed.

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