Fix clinic compiler warnings when using a getter and setter with a docstring.

Author: ZeroIntensity

Tools/clinic/libclinic/parse_args.py

@@ -157,9 +157,9 @@ def declare_parser(
         {{"{name}", {methoddef_cast}{c_basename}{methoddef_cast_end}, {methoddef_flags}, {c_basename}__doc__}},
 """)
 GETTERDEF_PROTOTYPE_DEFINE: Final[str] = libclinic.normalize_snippet(r"""
-    #if defined({getset_basename}_HAS_DOCSTR)
+    #if defined({getset_basename}_HAS_DOCSTR) && !defined({getset_basename}_DOCSTR)
     #  define {getset_basename}_DOCSTR {getset_basename}__doc__
-    #else
+    #elif !defined({getset_basename}_DOCSTR)
     #  define {getset_basename}_DOCSTR NULL
     #endif
     #if defined({getset_name}_GETSETDEF)
@@ -170,9 +170,9 @@ def declare_parser(
     #endif
 """)
 SETTERDEF_PROTOTYPE_DEFINE: Final[str] = libclinic.normalize_snippet(r"""
-    #if defined({getset_name}_HAS_DOCSTR)
+    #if defined({getset_basename}_HAS_DOCSTR) && !defined({getset_basename}_DOCSTR)
     #  define {getset_basename}_DOCSTR {getset_basename}__doc__
-    #else
+    #elif !defined({getset_basename}_DOCSTR)
     #  define {getset_basename}_DOCSTR NULL
     #endif
     #if defined({getset_name}_GETSETDEF)