Remove git_check_in_repo from genbuild.sh to fix gitian version string

This removes the git hash from gitian-build zcash version strings when
built inside gitian (when the state of the working tree is clean and
corresponds to an annotated tag).

share/genbuild.sh

@@ -20,13 +20,9 @@ else
     exit 1
 fi
 
-git_check_in_repo() {
-    ! { git status --porcelain -uall --ignored "$@" 2>/dev/null || echo '??'; } | grep -q '?'
-}
-
 DESC=""
 SUFFIX=""
-if [ "${BITCOIN_GENBUILD_NO_GIT}" != "1" ] && [ -e "$(command -v git)" ] && [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = "true" ] && git_check_in_repo share/genbuild.sh; then
+if [ "${BITCOIN_GENBUILD_NO_GIT}" != "1" ] && [ -e "$(command -v git)" ] && [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = "true" ]; then
     # clean 'dirty' status of touched files that haven't been modified
     git diff >/dev/null 2>/dev/null