bpo-35134: Add include/cpython/compile.h (GH-24922)

Move C API excluded from the limited C API from Include/compile.h
to a new Include/cpython/compile.h header file.
diff --git a/Lib/__future__.py b/Lib/__future__.py
index 0e7b555..326e2b2 100644
--- a/Lib/__future__.py
+++ b/Lib/__future__.py
@@ -42,7 +42,7 @@
 argument to the builtin function compile() to enable the feature in
 dynamically compiled code.  This flag is stored in the .compiler_flag
 attribute on _Future instances.  These values must match the appropriate
-#defines of CO_xxx flags in Include/compile.h.
+#defines of CO_xxx flags in Include/cpython/compile.h.
 
 No feature line is ever to be deleted from this file.
 """