eal/windows: export version function

eal/windows: export version function

When OVS inits, it calls rte_version to get the DPDK's version.
The patch fixes the error below by exposing rte_version symbol.
libopenvswitch.a(dpdk.c.obj) : error LNK2019: unresolved external symbol
rte_version referenced in function dpdk_init

Fixes: 5b637a848195 ("eal: fix querying DPDK version at runtime")
Cc: stable@dpdk.org
Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>