python3-gitdb: add it for python3-git

Need add python3-git to buildtools-tarball for the py3 build, and the
dependencies chain is:

python3-git -> python3-gitdb

(From OE-Core rev: b13babf07d77bcbed21c24761e2f4ada9ba85507)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3-gitdb_0.6.4.bb

@@ -0,0 +1,7 @@
+require python-gitdb.inc
+
+DEPENDS = "python3-async python3-smmap"
+
+inherit distutils3
+
+RDEPENDS_${PN} += "python3-smmap python3-async python3-mmap python3-lang python3-io python3-shell"