rename ulong to ulong64 to avoid the conflicts in <sys/types.h>
rename ulong to ulong64 to avoid the conflicts in <sys/types.h>

[ 31%] Building CXX object utests/CMakeFiles/utests.dir/compiler_abs_diff.cpp.o
/home/q/beignet.git/utests/compiler_abs_diff.cpp:201:18: error: conflicting declaration ‘typedef uint64_t ulong’
/usr/include/i386-linux-gnu/sys/types.h:151:27: error: ‘ulong’ has a previous declaration as ‘typedef long unsigned int ulong’

Signed-off-by: Lu Guanqun <2dad72ae5fe48bf7bd43ddccece96ab3f4a6c25d@intel.com>
Reviewed-by: Zhigang Gong <e04a7b9b70b1e4c6318cf117dcd1a9056e14b97a@linux.intel.com>

wdv4758h/beignet,ignatenkobrain/beignet,wdv4758h/beignet,zhenyw/beignet,wdv4758h/beignet,ignatenkobrain/beignet,wdv4758h/beignet,zhenyw/beignet,zhenyw/beignet,ignatenkobrain/beignet,freedesktop-unofficial-mirror/beignet,freedesktop-unofficial-mirror/beignet,freedesktop-unofficial-mirror/beignet,zhenyw/beignet,ignatenkobrain/beignet,ignatenkobrain/beignet,freedesktop-unofficial-mirror/beignet,wdv4758h/beignet,zhenyw/beignet