Abort on thread layer errors

Makes it easier to catch the bug in gdb as there is no need to set an
explicit breakpoint.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
diff --git a/qemu-thread-win32.c b/qemu-thread-win32.c
index a27332e..db8e744 100644
--- a/qemu-thread-win32.c
+++ b/qemu-thread-win32.c
@@ -24,7 +24,7 @@
                   NULL, err, 0, (LPTSTR)&pstr, 2, NULL);
     fprintf(stderr, "qemu: %s: %s\n", msg, pstr);
     LocalFree(pstr);
-    exit(1);
+    abort();
 }
 
 void qemu_mutex_init(QemuMutex *mutex)