build: fix GCC compilation error because of call of deprecated function `siginterrupt`

Error message:

> main_eventmon.cpp:109:17: error: ‘int siginterrupt(int, int)’ is deprecated: Use sigaction with SA_RESTART instead [-Werror=deprecated-declarations]

The migration from deprecated `siginterrupt(SIGINT, 1)` to `sigaction` is
inspired by the migration done in CPython, see
https://github.com/python/cpython/commit/f9c5e3f5f61cd380f8a17c814766fc3730b7fbdf

producer/event_monitor_producer/src/main_eventmon.cpp

@@ -105,8 +105,18 @@ int main (int argc, char* argv[]) {
     stop_signal = 0;
     std::signal(SIGINT, SignalHandler);
     std::signal(SIGTERM, SignalHandler);
-#if defined(__linux__) || defined (__APPLE__)
-    siginterrupt(SIGINT, 1);
+#if defined(__linux__) || defined(__APPLE__)
+    {
+        // Sets the flag SA_RESTART of `current_sigaction` to false to prevent SIGINT
+        // signals to be invoked again after it has been handled.
+        // The migration from deprecated `siginterrupt(SIGINT, 1)` to `sigaction`
+        // is inspired by the migration done in CPython, see
+        // https://github.com/python/cpython/commit/f9c5e3f5f61cd380f8a17c814766fc3730b7fbdf
+        struct sigaction current_sigaction;
+        sigaction(SIGINT, NULL, &current_sigaction);
+        current_sigaction.sa_flags &= ~SA_RESTART;
+        sigaction(SIGINT, &current_sigaction, NULL);
+    }
 #endif
 
     const auto logger = asapo::GetDefaultEventMonLogger();