Fix totalmem computation, see
https://rt.cpan.org/Public/Bug/Display.html?id=130740

Index: arch/bsd.xs
--- arch/bsd.xs.orig
+++ arch/bsd.xs
@@ -22,13 +22,14 @@ double
 totalmem()
 	PROTOTYPE: DISABLE
 	CODE:
-		unsigned long long ret = 0;
-		size_t len = sizeof (ret);
-#ifdef NETBSD
+#ifdef HW_PHYSMEM64
+		long long ret = 0;
 		static int mib[2] = { CTL_HW, HW_PHYSMEM64 };
 #else
+		int ret = 0;
 		static int mib[2] = { CTL_HW, HW_PHYSMEM };
 #endif
+		size_t len = sizeof (ret);
 
 		if (sysctl (mib, 2, &ret, &len, NULL, 0) != -1) {
       			RETVAL = (double) (ret);