python3: merge python3-email into python3-urllib

As we're seeing in various test.sh scrip runs, importing 'email' fails
with not finding 'urllib' and vice-versa.

Then via a7e96ec91 ("python3-email: add python3-urllib as dependency")
I created a circular dependency.
So, might as well merge the two packages into one (named python3-urllib)
and updates all dependencies to pull python3-urllib.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-flit-core/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-flit-core
 PKG_VERSION:=3.12.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=flit-core
 PYPI_SOURCE_NAME:=flit_core
@@ -34,7 +34,7 @@ define Package/python3-flit-core
   SUBMENU:=Python
   TITLE:=Distribution-building parts of Flit
   URL:=https://github.com/pypa/flit
-  DEPENDS:=+python3-light +python3-email +python3-logging
+  DEPENDS:=+python3-light +python3-urllib +python3-logging
   BUILDONLY:=1
 endef