Patches from Anderson Lizardo and Riku Voipio to reach Debian version 0.5-3.1

* Add generic support for arm targets
* Save funtion arguments on arm
* Add thumb instruction support
* Add basic arm/eabi support
* fix exec() testcase cleanup
* fix memory corruption in clone() test
* fix tracing child with "-p" option
diff --git a/ltrace.c b/ltrace.c
index 3a5f9aa..8ba1347 100644
--- a/ltrace.c
+++ b/ltrace.c
@@ -77,6 +77,7 @@
 	}
 	if (opt_o) {
 		fclose(output);
+		opt_o = 0;
 	}
 }