gh-111650: Ensure pyconfig.h includes Py_GIL_DISABLED on Windows (GH-112778)

PC/layout/main.py

@@ -73,7 +73,10 @@ def copy_if_modified(src, dest):
         )
 
     if do_copy:
-        shutil.copy2(src, dest)
+        try:
+            shutil.copy2(src, dest)
+        except FileNotFoundError:
+            raise FileNotFoundError(src) from None
 
 
 def get_lib_layout(ns):
@@ -208,8 +211,7 @@ def _c(d):
 
         for dest, src in rglob(ns.source / "Include", "**/*.h"):
             yield "include/{}".format(dest), src
-        src = ns.source / "PC" / "pyconfig.h"
-        yield "include/pyconfig.h", src
+        yield "include/pyconfig.h", ns.build / "pyconfig.h"
 
     for dest, src in get_tcltk_lib(ns):
         yield dest, src

PC/pyconfig.h.in

@@ -739,4 +739,7 @@ Py_NO_ENABLE_SHARED to find out.  Also support MS_NO_COREDLL for b/w compat */
 /* Define if libssl has X509_VERIFY_PARAM_set1_host and related function */
 #define HAVE_X509_VERIFY_PARAM_SET1_HOST 1
 
+/* Define if you want to disable the GIL */
+#undef Py_GIL_DISABLED
+
 #endif /* !Py_CONFIG_H */

PC/winsound.c

@@ -35,6 +35,8 @@
    winsound.PlaySound(None, 0)
 */
 
+#include "pyconfig.h"  // Py_GIL_DISABLED
+
 #ifndef Py_GIL_DISABLED
 // Need limited C API version 3.12 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
 #define Py_LIMITED_API 0x030c0000