[fixup] Fix zc.recipe.egg tests

Fixup [feat] zc.recipe.egg: Improve on the fly patches.

Some zc.recipe.egg tests were never adapted to zc.buildout 3.0.1
now using pip and wheel in addition to setuptools.

zc.recipe.egg_/src/zc/recipe/egg/patches.rst

@@ -56,8 +56,10 @@ The installed egg has the slapospatched001 marker
 
     >>> ls(sample_buildout, 'eggs')
     d  demoneeded-1.1+slapospatched001-pyN.N.egg
-    -  setuptools-0.7-py2.3.egg
-    d  zc.buildout-1.0-py2.3.egg
+    -  pip.egg-link
+    -  setuptools.egg-link
+    -  wheel.egg-link
+    zc.buildout.egg
 
 The code of the egg has been patched:
 
@@ -115,8 +117,10 @@ The installed egg has the slapospatched001 marker
     >>> ls(sample_buildout, 'eggs')
     d  demo-0.3-pyN.N.egg
     d  demoneeded-1.1+slapospatched001-pyN.N.egg
-    -  setuptools-0.7-py2.3.egg
-    d  zc.buildout-1.0-py2.3.egg
+    -  pip.egg-link
+    -  setuptools.egg-link
+    -  wheel.egg-link
+    zc.buildout.egg
 
 If we run the demo script we see the patch was applied: