Backport bpo-41675: Modernize siginterrupt calls

Summary:
The OSS build fails at compilation with this error:
```
/home/aniketpanse/cinder/Modules/signalmodule.c: In function ‘signal_siginterrupt_impl’:
/home/aniketpanse/cinder/Modules/signalmodule.c:661:5: error: ‘siginterrupt’ is deprecated: Use sigaction with SA_RESTART instead [-Werror=deprecated-declarations]
  661 |     if (siginterrupt(signalnum, flag)<0) {
      |     ^~
In file included from /home/aniketpanse/cinder/Modules/signalmodule.c:26:
/usr/include/signal.h:311:12: note: declared here
  311 | extern int siginterrupt (int __sig, int __interrupt) __THROW
      |            ^~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile:2431: Modules/signalmodule.o] Error 1
make: *** Waiting for unfinished jobs....
```

Backport upstream fix from python/cpython#22028

Reviewed By: carljm

Differential Revision: D28297270

fbshipit-source-id: 6a0125b

Author: czardoz

Modules/signalmodule.c

@@ -658,7 +658,19 @@ signal_siginterrupt_impl(PyObject *module, int signalnum, int flag)
                         "signal number out of range");
         return NULL;
     }
-    if (siginterrupt(signalnum, flag)<0) {
+#ifdef HAVE_SIGACTION
+    struct sigaction act;
+    (void) sigaction(signalnum, NULL, &act);
+    if (flag) {
+        act.sa_flags &= ~SA_RESTART;
+    }
+    else {
+        act.sa_flags |= SA_RESTART;
+    }
+    if (sigaction(signalnum, &act, NULL) < 0) {
+#else
+    if (siginterrupt(signalnum, flag) < 0) {
+#endif
         PyErr_SetFromErrno(PyExc_OSError);
         return NULL;
     }