add missing linux entry

imapd/imapd.spec

@@ -58,6 +58,7 @@ AutoReqProv:  no
     case "%{l_target}" in
         *-freebsd* ) ldflags="-lpam -lcrypt" ;;
         *-solaris* ) ldflags="-lpam"         ;;
+        *-linux*   ) ldflags="-lpam -lcrypt" ;;
     esac
     CC="%{l_cc}" \
     CPPFLAGS="$cflags" \