Fix compilation issues with buck (#610)

* Fix compilation warning with -Wmisleading-indentation

When compile with -Wmisleading-indentation, it reports warning:
misleading indentation; statement is not part of the previous 'if'

This patch fixes it

* Avoid relative include file path

We don't need relative include file paths for src/graph/*.h
since src/ is already in CMake include_directories

src/collectives/device/common.h

@@ -292,8 +292,8 @@ class ncclFunction {
 #endif
 
 __device__ inline bool barrierReduceAny(int bit, uint32_t* abortCount) {
-  if (bit) atomicAdd(abortCount, 1); \
-  __syncthreads(); \
+  if (bit) atomicAdd(abortCount, 1);
+  __syncthreads();
   return atomicAdd(abortCount, 0) != 0;
 }