Fix CinderX build with Python 3.14.2

Summary:
FT_ATOMIC_LOAD_PTR_CONSUME was added in 3.14.3.  When we try to build CinderX
for 3.14.2, it breaks because this isn't defined.  Follow what the original PR
was doing and define it to acquire semantics, which are stronger than consume.

See python/cpython#142544 that added this.

Reviewed By: yoney

Differential Revision: D93925688

fbshipit-source-id: f032caaed424b0f6e883d61627664a8bbd1c5379

Author: alexmalyshev

cinderx/UpstreamBorrow/borrowed.h

@@ -127,6 +127,12 @@
 #define _PyDict_DelItem_KnownHash_LockHeld _CiDict_DelItem_KnownHash_LockHeld
 #define _PyInterpreterState_GetConfig _CiInterpreterState_GetConfig
 
+// The 3.14 file is built with 3.14.3, which includes gh-142534 that defines
+// this new macro.  The lack of it on earlier point releases breaks the build.
+#if PY_VERSION_HEX >= 0x030E0000 && PY_VERSION_HEX < 0x030E0300
+#define FT_ATOMIC_LOAD_PTR_CONSUME FT_ATOMIC_LOAD_PTR_ACQUIRE
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif