python-whoosh: add RDEPENDS to work on minimal python installs

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-python/recipes-devtools/python/python3-whoosh_2.7.4.bb

@@ -1,2 +1,9 @@
 inherit pypi setuptools3
 require python-whoosh.inc
+
+# Requires _pydecimal.py which is in misc
+RDEPENDS_${PN} += " \
+    ${PYTHON_PN}-enum \
+    ${PYTHON_PN}-misc \
+    ${PYTHON_PN}-selectors \
+"