NCCL 2.26.6-1

Fix profiler_v2 compatibility layer
 * Removing trafficBytes in profiler_v3 breaks casting to ncclProfilerEventDescr_v2_t
   in the compatibility layer for profiler_v2 interface. This patch fixes the issue
   by making the conversion between the two descriptors explicit.

makefiles/version.mk

@@ -1,6 +1,6 @@
 ##### version
 NCCL_MAJOR   := 2
 NCCL_MINOR   := 26
-NCCL_PATCH   := 5
+NCCL_PATCH   := 6
 NCCL_SUFFIX  :=
 PKG_REVISION := 1