increased version number to 0.9.12
port locking is done as /var/lock/LCK..usb_tts_0 for /dev/usb/tts/0
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@246 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
replaced OPEN_MAX with sysconf()
replaced mktemp() with mkstemp()
unlock serial port if open() fails
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@132 3ae390bd-cb1e-0410-b409-cd5a39f66f1f