deprecation warnings in vxWorks 6.9

[dirk-zimoch]

../src/StreamEpics.cc: In static member function 'static long int Stream::drvInit()':
../src/StreamEpics.cc:450: warning: 'STATUS symFindByName(symtab*, char*, char**, SYM_TYPE*)' is deprecated (declared at /afs/psi.ch/project/vxworks/VxWorks6.9/vxworks-6.9/target/h/symLib.h:181)
../src/StreamEpics.cc:451: warning: deprecated conversion from string constant to 'char*'
../src/StreamEpics.cc:451: warning: 'STATUS symFindByName(symtab*, char*, char**, SYM_TYPE*)' is deprecated (declared at /afs/psi.ch/project/vxworks/VxWorks6.9/vxworks-6.9/target/h/symLib.h:181)
../src/StreamEpics.cc:454: warning: 'STATUS symFindByName(symtab*, char*, char**, SYM_TYPE*)' is deprecated (declared at /afs/psi.ch/project/vxworks/VxWorks6.9/vxworks-6.9/target/h/symLib.h:181)
../src/StreamEpics.cc:455: warning: deprecated conversion from string constant to 'char*'
../src/StreamEpics.cc:455: warning: 'STATUS symFindByName(symtab*, char*, char**, SYM_TYPE*)' is deprecated (declared at /afs/psi.ch/project/vxworks/VxWorks6.9/vxworks-6.9/target/h/symLib.h:181)

symFindByName should be replaced with symFind for vxWorks 6.9.