use half the cores when building nodejs

Author: truib

eb_hooks.py

@@ -1269,6 +1269,9 @@ def set_maximum(parallel, max_value):
         '*': (divide_by_factor, 2),
         CPU_TARGET_A64FX: (set_maximum, 12),
     },
+    'nodejs': {
+        CPU_TARGET_A64FX: (divide_by_factor, 2),
+    },
     'MBX': {
         '*': (divide_by_factor, 2),
     },