mysql-python: Enable only when meta-py2 is present

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-dbs/mysql/mysql-python_1.2.5.bb

@@ -16,4 +16,9 @@ SRC_URI[sha256sum] = "811040b647e5d5686f84db415efd697e6250008b112b6909ba77ac059e
 
 S = "${WORKDIR}/${SRCNAME}-${PV}"
 
-inherit setuptools3
+inherit setuptools
+
+python() {
+    if 'meta-python2' not in d.getVar('BBFILE_COLLECTIONS').split():
+        raise bb.parse.SkipRecipe('Requires meta-python2 to be present.')
+}