tests: check decoding of chown32 syscall

* tests/chown32.c: New file.
* tests/chown32.test: New test.
* tests/.gitignore: Add chown32.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add chown32.test.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0a2ac1c..0888a5a 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -69,6 +69,7 @@
 	caps \
 	chmod \
 	chown \
+	chown32 \
 	chroot \
 	clock_nanosleep \
 	clock_xettime \
@@ -278,6 +279,7 @@
 	caps.test \
 	chmod.test \
 	chown.test \
+	chown32.test \
 	chroot.test \
 	clock_nanosleep.test \
 	clock_xettime.test \