genbuild: Specify rev-parse length

Author: dongcarl

share/genbuild.sh

@@ -31,7 +31,7 @@ if [ "${BITCOIN_GENBUILD_NO_GIT}" != "1" ] && [ -e "$(command -v git)" ] && [ "$
     fi
 
     # otherwise generate suffix from git, i.e. string like "59887e8-dirty"
-    GIT_COMMIT=$(git rev-parse --short HEAD)
+    GIT_COMMIT=$(git rev-parse --short=12 HEAD)
     git diff-index --quiet HEAD -- || GIT_COMMIT="$GIT_COMMIT-dirty"
 fi