version.sh fix a few bashism...

script version.sh does not appear to be a /bin/sh script
possible bashism in version.sh line 7 (should be 'b = a'):
if [ "x${ARCH}" == "xx86_64" ] || [ "x${ARCH}" == "xi686" ] ; then
possible bashism in version.sh line 9 (let ...):
        let CORES=$CORES+1
possible bashism in version.sh line 14 (should be >word 2>&1):
LC_ALL=C git help pull | grep -m 1 -e "--no-edit" &>/dev/null && GIT_NOEDIT=1
possible bashism in version.sh line 17 (should be VAR="${VAR}foo"):
        GIT_OPTS+="--no-edit"

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>