remove undefined computeColl declaration

[ROCm/rccl commit: ebf0417e90]

projects/rccl/src/enqueue.cc

@@ -43,8 +43,6 @@ static ncclKernelMatch const ncclKerns[1] = {
 };
 #endif
 
-static ncclResult_t computeColl(struct ncclInfo* info /* input */, int* workFuncIndex, struct ncclWorkElem* work, struct ncclProxyOp* proxyOp /* output */);
-
 NCCL_PARAM(L1SharedMemoryCarveout, "L1_SHARED_MEMORY_CARVEOUT", 0);
 
 static ncclResult_t initCollWorkElem(struct ncclInfo* collInfo, struct ncclWorkElem* work);