b4: new package

Add a recipe for b4 - a utility for working with mailing-list based
development workflows.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/b4/b4_0.14.2.bb

@@ -0,0 +1,13 @@
+SUMMARY = "Utility to work with patches made available via a public-inbox archive like lore.kernel.org."
+
+LICENSE = "GPL-2.0-only"
+LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
+
+inherit pypi python_pep517 python_setuptools_build_meta
+
+SRC_URI[sha256sum] = "4f835b6e5ae30eff6004bb25c15fd8f4f6ecd1105596e86db1871fef7d18113d"
+
+RDEPENDS:${PN} += " \
+    python3-mailbox \
+    python3-requests \
+"