If dyld-info is not available, don't try to compile unreachable code
using it either.

--- gdb-1461.2/src/gdb/macosx/macosx-nat-dyld.c
+++ gdb-1461.2/src/gdb/macosx/macosx-nat-dyld.c
@@ -731,7 +731,7 @@
 {
 #if !defined (TASK_DYLD_INFO) || !defined (NM_NEXTSTEP)
   return 0;
-#endif
+#else
 
   if (target_is_remote () || value == NULL)
     return 0;
@@ -791,6 +791,7 @@
     }
 #endif /* NM_NEXTSTEP */
   return 0;
+#endif
 }
 
 /* Searches the target address space for dyld itself, returning it in