build: clean up version script

build: clean up version script

Remove symbols from libnvme.map that don't exist in libnvme.so.
These are a mix of static inline functions,
static (unexported) functions, nonexistent functions, and types.
Also remove a couple of duplicate symbols.

Bash script to find unexported symbols:
for symbol in `grep -o nvm[ef]_[a-z0-9_]* src/libnvme.map`
do
    if nm -D .build/src/libnvme.so | grep $symbol$ > /dev/null
    then
        true
    else
        echo $symbol
    fi
done

Bash command to find duplicated symbols:
grep nvm src/libnvme.map | uniq -c | grep -v '^\s*1 '

Signed-off-by: Caleb Sander <csander@purestorage.com>