Debugger: Fix interrupting via console

Amends 89646aadce.

Change-Id: Ibb644dc8897a967bd691155fe5be2eb2165b01f9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/libs/utils/process_stub_unix.c

@@ -325,6 +325,13 @@ int main(int argc, char *argv[])
                                 kill(chldPid, SIGKILL);
                             }
                             break;
+                        case 'i':
+                            if (chldPid > 0) {
+                                int res = kill(chldPid, SIGINT);
+                                if (res)
+                                    perror("Stub could not interrupt inferior");
+                            }
+                            break;
                         case 'c': {
                             int res = write(blockingPipe[1], &c, 1);
                             if (res < 0)