GPU OpenCL: Use typedef instead of define

Author: davidrohr

GPU/GPUTracking/Base/opencl-common/GPUReconstructionOCL.cl

@@ -58,14 +58,14 @@
   #define nullptr NULL
   #define NULL (0x0)
 #endif
-#define uint64_t unsigned long
-#define uint32_t unsigned int
-#define uint16_t unsigned short
-#define uint8_t unsigned char
-#define int64_t long
-#define int32_t int
-#define int16_t short
-#define int8_t signed char
+typedef unsigned long uint64_t;
+typedef unsigned int uint32_t;
+typedef unsigned short uint16_t;
+typedef unsigned char uint8_t;
+typedef signed long int64_t;
+typedef signed int int32_t;
+typedef signed short int16_t;
+typedef signed char int8_t;
 
 // Disable assertions since they produce errors in GPU Code
 #ifdef assert