Fix hipcc warning related to hipVersion (#1767)

* Fix hipcc warning related to hipVersion
* Rename hipVersion.h to hip_version.h
* Remove HIP_VERSION splitting
* Update .gitignore
- Ignore generated include/hip/hip_version.h
- Removed some stale entries
- Added executables from samples/1_Utils/*/ for consistency with bin/ entries.

include/hip/hip_runtime.h

@@ -49,7 +49,7 @@ THE SOFTWARE.
 #include <thread>
 #endif
 
-#include <hip/hipVersion.h>
+#include <hip/hip_version.h>
 #include <hip/hip_common.h>
 
 #if defined(__HIP_PLATFORM_HCC__) && !defined(__HIP_PLATFORM_NVCC__)