fix use of popen() to work on systems that reset PATH for popen'ed command (e.g. OS X)
fix use of popen() to work on systems that reset PATH for popen'ed command (e.g. OS X)

git-svn-id: 9d792367086e53bac42cb25f723fe47762daf29a@1084 0c269be4-1314-0410-8aa9-9f06e86f4224

drobilla/jack1,adiknoth/tschack,drobilla/jack1,drobilla/jack1,drobilla/jack1,ventosus/jack1,ventosus/jack1,ventosus/jack1,adiknoth/tschack,ventosus/jack1