We didn't even have prototypes for these APIs since long ago, when the
prototypes were removed, but misteriously the implementations remained.
Both glibc and musl provide getspnam(3), so this file was effectively
being ignored by the compiler. Just remove it.
Also remove the check for getspnam, which isn't used elsewhere.
Fixes: 0ee095abd8db (2007-10-07; "[svn-upgrade] Integrating new upstream version, shadow (4.0.7)")
Closes: <https://github.com/shadow-maint/shadow/issues/1228>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
844e03a68f