workqueue: rename private to priv for compiling as c++
Given the main.cc source file:
#include <fio.h>
int main() { return 0; }
And the gcc command line:
gcc main.cc -Ifio -DCONFIG_HAVE_BOOL
In file included from ./ioengine.h:10:0,
from ./iolog.h:7,
from ./stat.h:4,
from ./thread_options.h:7,
from ./fio.h:18,
from main.cc:1:
./workqueue.h:19:8: error: expected unqualified-id before ‘private’
void *private;
^
./workqueue.h:19:7: error: expected ‘;’ at end of member declaration
void *private;
^
./workqueue.h:19:15: error: expected ‘:’ before ‘;’ token
void *private;
^
Signed-off-by: Casey Bodley <cbodley@redhat.com>