Make -s option message consistent with -C messages

was:
[00:00:05] ====>> (-C) Cleaning specified ports to build
[00:00:05] ====>> (-C) Deleting existing package: joe-3.7_2,1.txz
[00:00:06] ====>> (-s) [00:00:06] ====>> Skipping incremental rebuild\
 and repository sanity checks

now is:
[00:00:05] ====>> (-C) Cleaning specified ports to build
[00:00:05] ====>> (-C) Deleting existing package: joe-3.7_2,1.txz
[00:00:06] ====>> (-s) Skipping incremental rebuild and repository\
 sanity checks