Don't use Pillow for IT.

There was no proncipled reason to use it. Neither the originating commit
or its originiating issue refer to Pillow and the tests themselves don't
implicate anything being required except a 3rdparty lib.

See:
+ pex-tool#521
+ pex-tool#508

tests/integration/test_integration.py

@@ -735,24 +735,20 @@ def test_pex_resource_bundling():
             assert stdout == b"hello\n"
 
 
-def test_entry_point_verification_3rdparty():
-    # type: () -> None
-    with temporary_dir() as td:
-        pex_out_path = os.path.join(td, "pex.pex")
-        res = run_pex_command(
-            ["Pillow==5.2.0", "-e", "PIL:Image", "-o", pex_out_path, "--validate-entry-point"]
-        )
-        res.assert_success()
+def test_entry_point_verification_3rdparty(tmpdir):
+    # type: (Any) -> None
+    pex_out_path = os.path.join(str(tmpdir), "pex.pex")
+    run_pex_command(
+        args=["ansicolors==1.1.8", "-e", "colors:red", "-o", pex_out_path, "--validate-entry-point"]
+    ).assert_success()
 
 
-def test_invalid_entry_point_verification_3rdparty():
-    # type: () -> None
-    with temporary_dir() as td:
-        pex_out_path = os.path.join(td, "pex.pex")
-        res = run_pex_command(
-            ["Pillow==5.2.0", "-e", "PIL:invalid", "-o", pex_out_path, "--validate-entry-point"]
-        )
-        res.assert_failure()
+def test_invalid_entry_point_verification_3rdparty(tmpdir):
+    # type: (Any) -> None
+    pex_out_path = os.path.join(str(tmpdir), "pex.pex")
+    run_pex_command(
+        args=["ansicolors==1.1.8", "-e", "colors:bad", "-o", pex_out_path, "--validate-entry-point"]
+    ).assert_failure()
 
 
 def test_multiplatform_entrypoint():