Fix build issues with GCC < 4.5
 + Space/or/Newline needed for loops with empty bodies
 + __host__ and __device__ redefined due to push/pop macros not existing on GCC < 4.5.
Merge pull request #597 from kperelygin/1.8.0

Fix build issues with GCC < 4.5
Merge pull request #598 from thrust/1.8.0

1.8.0