Make a compile test runnable.

tests/compile/funcptr.pyx

-# mode: compile
-
-cdef int grail():
-    cdef int (*spam)()
-    spam = &grail
-    spam = grail
-    spam()
-
-ctypedef int funcptr_t()
-
-cdef inline funcptr_t* dummy():
-    return &grail

tests/run/cfuncptr.pyx

+# mode: run
+
+
+cdef int grail():
+    cdef int (*spam)()
+    spam = &grail
+    spam = grail
+    assert spam is grail
+    assert spam == grail
+    assert spam == &grail
+
+
+ctypedef int funcptr_t()
+
+cdef funcptr_t* get_grail():
+    return &grail
+
+
+def test_assignments():
+    """
+    >>> test_assignments()
+    """
+    grail()
+
+
+def test_return_value():
+    """
+    >>> test_return_value()
+    True
+    """
+    g = get_grail()
+    return g == &grail
+
+
+def call_cfuncptr():
+    """
+    >>> call_cfuncptr()
+    """
+    cdef int (*spam)()
+    spam = grail
+    spam()