do not use shallow cloning with git.osmocom.org

==> Cloning git://git.osmocom.org/gr-osmosdr
git clone --depth 1 git://git.osmocom.org/gr-osmosdr /Library/Caches/Homebrew/gr-osmosdr--git
Cloning into '/Library/Caches/Homebrew/gr-osmosdr--git'...
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
Error: Failed to download resource "gr-osmosdr"