bpo-35081: Add pycore_ prefix to internal header files (GH-10263)

* Rename Include/internal/ header files:

  * pyatomic.h -> pycore_atomic.h
  * ceval.h -> pycore_ceval.h
  * condvar.h -> pycore_condvar.h
  * context.h -> pycore_context.h
  * pygetopt.h -> pycore_getopt.h
  * gil.h -> pycore_gil.h
  * hamt.h -> pycore_hamt.h
  * hash.h -> pycore_hash.h
  * mem.h -> pycore_mem.h
  * pystate.h -> pycore_state.h
  * warnings.h -> pycore_warnings.h

* PCbuild project, Makefile.pre.in, Modules/Setup: add the
  Include/internal/ directory to the search paths of header files.
* Update includes. For example, replace #include "internal/mem.h"
  with #include "pycore_mem.h".

Author: vstinner

Include/internal/pyatomic.h Include/internal/pycore_atomic.hInclude/internal/pyatomic.h renamed to Include/internal/pycore_atomic.h

@@ -4,7 +4,7 @@
 extern "C" {
 #endif
 
-#include "internal/pyatomic.h"
+#include "pycore_atomic.h"
 #include "pythread.h"
 
 struct _pending_calls {
@@ -25,7 +25,7 @@ struct _pending_calls {
     int last;
 };
 
-#include "internal/gil.h"
+#include "pycore_gil.h"
 
 struct _ceval_runtime_state {
     int recursion_limit;

Include/internal/ceval.h Include/internal/pycore_ceval.hInclude/internal/ceval.h renamed to Include/internal/pycore_ceval.h

@@ -2,7 +2,7 @@
 #define Py_INTERNAL_CONTEXT_H
 
 
-#include "internal/hamt.h"
+#include "pycore_hamt.h"
 
 
 struct _pycontextobject {

Include/internal/condvar.h Include/internal/pycore_condvar.hInclude/internal/condvar.h renamed to Include/internal/pycore_condvar.h

@@ -4,8 +4,8 @@
 extern "C" {
 #endif
 
-#include "internal/condvar.h"
-#include "internal/pyatomic.h"
+#include "pycore_condvar.h"
+#include "pycore_atomic.h"
 
 #ifndef Py_HAVE_CONDVAR
 #  error You need either a POSIX-compatible or a Windows system!

Include/internal/context.h Include/internal/pycore_context.hInclude/internal/context.h renamed to Include/internal/pycore_context.h

@@ -7,9 +7,9 @@ extern "C" {
 #include "pystate.h"
 #include "pythread.h"
 
-#include "internal/mem.h"
-#include "internal/ceval.h"
-#include "internal/warnings.h"
+#include "pycore_mem.h"
+#include "pycore_ceval.h"
+#include "pycore_warnings.h"
 
 
 /* GIL state */