* Set target to be 9.0 - libgit2 has been compiled with the target of
9.0, so for now lets support that. Later we can figure out how to target
8.0, if required.
* Set the BUILD_NUMBER and BUILD_VERSION correctly. In new flutter
projects these values are automatically set, but since I created this
project before those patches went it, we need to set it up.
* Do not target only arm64.
* Set the correct CFBundleName. It was set to 'journal' instead of
'GitJournal'.