python3-pyserial: also remove /usr/bin/__pycache__

PEP-517 packaging tries to also ship ${bindir}/__pycache__,
since we are removing all the scripts from ${bindir}, remove the cache
as well.

Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>

meta-python/recipes-devtools/python/python3-pyserial_3.5.bb

@@ -9,6 +9,7 @@ inherit pypi setuptools3 ptest
 do_install:append() {
     rm -f ${D}${bindir}/pyserial-miniterm
     rm -f ${D}${bindir}/pyserial-ports
+    rm -rf ${D}${bindir}/__pycache__
     rmdir ${D}${bindir}
 }