netdev-linux: Fix unaligned access to rpl_rtnl_link_stats64. #2413

Job	Run time
linux deb no dpdk	6m 15s
linux rpm fedora	3m 58s
osx clang --disable-ssl	1m 41s
dpdk gcc	9s
clang-analyze	17m 54s
linux gcc --disable-ssl	2m 32s
linux clang --disable-ssl	2m 29s
linux gcc c99	2m 17s
linux clang c99	2m 31s
linux gcc test	8m 3s
linux clang address,undefined test	16m 6s
linux gcc test --enable-shared	11m 8s
linux clang test --enable-shared	11m 2s
linux gcc check check-dpdk dpdk	17m 53s
linux clang check check-dpdk dpdk	17m 46s
linux gcc test -ljemalloc	8m 34s
linux clang test -ljemalloc	8m 47s
linux gcc --enable-afxdp	2m 18s
linux clang --enable-afxdp	2m 28s
linux gcc dpdk --enable-shared	3m 26s
linux clang dpdk --enable-shared	3m 29s
linux gcc dpdk-shared	2m 41s
linux clang dpdk-shared	3m 23s
linux gcc dpdk-shared --enable-shared	3m 30s
linux clang dpdk-shared --enable-shared	3m 28s
linux gcc m32 --disable-ssl	2m 24s
linux gcc check-ovsdb-cluster	6m 33s
linux gcc check-kernel -100	8m 51s
linux gcc check-kernel 100-	9m 26s
linux clang address,undefined check-kernel -100	11m 24s
linux clang address,undefined check-kernel 100-	12m 3s
linux gcc check-offloads -100	8m 56s
linux gcc check-offloads 100-	7m 50s
linux gcc dpdk check-system-userspace	10m 51s
linux clang address,undefined dpdk check-system-userspace	14m 20s
linux gcc dpdk check-system-tso	11m 3s
linux gcc dpdk check-afxdp	11m 5s
	4h 38m 34s

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