Clean up NetBSD libc Minix port.

This patch add the proper .if/.else/.endif to the Makefiles, add places I forgot #ifdef __minix and remove newlines.

lib/nbsd_libc/misc/stack_protector.c

@@ -63,6 +63,7 @@ __guard_setup(void)
 
 	if (__stack_chk_guard[0] != 0)
 		return;
+
 #ifndef __minix
 	mib[0] = CTL_KERN;
 	mib[1] = KERN_ARND;