improve handling of modern SCSI disks (SAS SSDs)

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3896 4ea69e1a-61f1-4043-bf83-b5c94c648137
autogen.sh: Allow automake 1.14, suppress 'subdir-objects' warning.
Makefile.am: Add new 'compile' script to target 'maintainer-clean'.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3897 4ea69e1a-61f1-4043-bf83-b5c94c648137