fix LD_WRAP test in configure

The LD_WRAP test in configure was broken, and failed to
indicate LD_WRAP support correctly, resulting in some unit
tests failing to run.

configure.ac

@@ -1320,11 +1320,11 @@ AM_CONDITIONAL([HAVE_CMOCKA], [test "$with_cmocka" = "yes"])
 LD_WRAP_TESTS=false
 AC_MSG_CHECKING([for linker support for --wrap option])
 AX_SAVE_FLAGS([wrap])
-LDFLAGS="-Wl,-wrap,exit"
+LDFLAGS="-Wl,--wrap,exit"
 AC_RUN_IFELSE(
     [AC_LANG_PROGRAM([[#include <stdlib.h>
 		       void __real_exit (int status);
-		       void __wrap_exit (int status) { __real_exit (status); }
+		       void __wrap_exit (int status) { __real_exit (0); }
 		      ]],
 		     [[exit (1);]])],
     [LD_WRAP_TESTS=true