autoconf: Add -liconv to LIBS when NEEDS_LIBICONV

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

configure.ac

@@ -147,6 +147,7 @@ AC_CHECK_LIB([c], [iconv],
 [NEEDS_LIBICONV=],
 [NEEDS_LIBICONV=YesPlease])
 AC_SUBST(NEEDS_LIBICONV)
+test -n "$NEEDS_SOCKET" && LIBS="$LIBS -liconv"
 #
 # Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
 # Patrick Mauritz).