bpo-29464: Rename METH_FASTCALL to METH_FASTCALL|METH_KEYWORDS and make (#1955)

the bare METH_FASTCALL be used for functions with positional-only
parameters.
diff --git a/Modules/clinic/sha512module.c.h b/Modules/clinic/sha512module.c.h
index c91dfd2..09cd3fe 100644
--- a/Modules/clinic/sha512module.c.h
+++ b/Modules/clinic/sha512module.c.h
@@ -72,7 +72,7 @@
 "Return a new SHA-512 hash object; optionally initialized with a string.");
 
 #define _SHA512_SHA512_METHODDEF    \
-    {"sha512", (PyCFunction)_sha512_sha512, METH_FASTCALL, _sha512_sha512__doc__},
+    {"sha512", (PyCFunction)_sha512_sha512, METH_FASTCALL|METH_KEYWORDS, _sha512_sha512__doc__},
 
 static PyObject *
 _sha512_sha512_impl(PyObject *module, PyObject *string);
@@ -102,7 +102,7 @@
 "Return a new SHA-384 hash object; optionally initialized with a string.");
 
 #define _SHA512_SHA384_METHODDEF    \
-    {"sha384", (PyCFunction)_sha512_sha384, METH_FASTCALL, _sha512_sha384__doc__},
+    {"sha384", (PyCFunction)_sha512_sha384, METH_FASTCALL|METH_KEYWORDS, _sha512_sha384__doc__},
 
 static PyObject *
 _sha512_sha384_impl(PyObject *module, PyObject *string);
@@ -124,4 +124,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=7bb7a49159e9b469 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=2f6ad0831d16c35f input=a9049054013a1b77]*/