audio/libtremor: bump PORTREVISION in consumers after r395232

libvorbisidec.so.1.0.2 -> libvorbisidec.so.1.0.3

ACC report: https://people.freebsd.org/~jbeich/compat_reports/libtremor/1.2.0.s20040213_to_1.2.1.s20150105/compat_report.html
Pointy hat to: jbeich
MFH: 2015Q3 (ports-secteam reliability blanket)