error: add EMLINK mapping

fix joyent/node#7307

include/uv.h

@@ -135,6 +135,7 @@ extern "C" {
   XX( 62, ETXTBSY, "text file is busy")                                       \
   XX( 63, ERANGE, "result too large")                                         \
   XX( 64, ENXIO, "no such device or address")                                 \
+  XX( 65, EMLINK, "too many links")                                           \
 
 
 #define UV_ERRNO_GEN(val, name, s) UV_##name = val,

src/unix/error.c

@@ -109,6 +109,7 @@ uv_err_code uv_translate_sys_error(int sys_errno) {
     case ETXTBSY: return UV_ETXTBSY;
     case ERANGE: return UV_ERANGE;
     case ENXIO: return UV_ENXIO;
+    case EMLINK: return UV_EMLINK;
     default: return UV_UNKNOWN;
   }
   UNREACHABLE();