gh-73487: Convert _decimal to use Argument Clinic (part 6)

Author: skirpichev

Makefile.pre.in

@@ -3355,7 +3355,7 @@ MODULE_UNICODEDATA_DEPS=$(srcdir)/Modules/unicodedata_db.h $(srcdir)/Modules/uni
 MODULE__CTYPES_DEPS=$(srcdir)/Modules/_ctypes/ctypes.h
 MODULE__CTYPES_TEST_DEPS=$(srcdir)/Modules/_ctypes/_ctypes_test_generated.c.h
 MODULE__CTYPES_MALLOC_CLOSURE=@MODULE__CTYPES_MALLOC_CLOSURE@
-MODULE__DECIMAL_DEPS=$(srcdir)/Modules/_decimal/docstrings.h @LIBMPDEC_INTERNAL@
+MODULE__DECIMAL_DEPS=@LIBMPDEC_INTERNAL@
 MODULE__ELEMENTTREE_DEPS=$(srcdir)/Modules/pyexpat.c @LIBEXPAT_INTERNAL@
 MODULE__HASHLIB_DEPS=$(srcdir)/Modules/hashlib.h
 MODULE__IO_DEPS=$(srcdir)/Modules/_io/_iomodule.h