fix(rccl): disable symmetric kernels when GENERATE_SYM_KERNELS is OFF

projects/rccl/src/sym_kernels.cc

@@ -260,6 +260,7 @@ static bool ncclSymkImplemented(ncclFunc_t coll, int/*ncclDevRedOp_t*/ red, nccl
 }
 
 static uint32_t ncclSymkMask(struct ncclComm* comm, ncclFunc_t coll, int/*ncclDevRedOp_t*/ red, ncclDataType_t ty, size_t nElts) {
+#if defined(GENERATE_SYM_KERNELS) && GENERATE_SYM_KERNELS
   uint32_t kmask = kernelMask_coll(coll);
   kmask &= kernelMask_user();
 
@@ -299,6 +300,9 @@ static uint32_t ncclSymkMask(struct ncclComm* comm, ncclFunc_t coll, int/*ncclDe
   if (nBusBytes >= 32*(size_t(2)<<30)) kmask = 0;
 
   return kmask;
+#else
+  return 0;
+#endif
 }
 
 bool ncclSymkAvailable(struct ncclComm* comm, ncclFunc_t coll, int/*ncclDevRedOp_t*/ red,