Eliminate tapedev.h warning messages

tapedev.h:366: warning: 'tapedev_init_handler' declared
'static' but never defined
tapedev.h:367: warning: 'tapedev_close_device' declared
'static' but never defined
tapedev.h:368: warning: 'tapedev_query_device' declared
'static' but never defined
Eliminate tapeccws.c warning messages

tapeccws.c:3748: warning: unused parameter 'ccwcode'
tapeccws.c:4056: warning: suggest braces around empty body in an 'else'
statement
tapeccws.c:4135: warning: unused parameter 'ccwcode'
Eliminate scsitape.c warning messages

scsitape.c:1584: warning: unused parameter 'notused'
scsitape.c:2004: warning: unused parameter 'notused'
Eliminate omatape.c warning messages

omatape.c: In function 'bsb_omatape':
omatape.c:1125: warning: 'prvhdro' may be used uninitialized in this
function