fix mbregex without mbstring failed check (fix #96)

config/ext.json

@@ -165,8 +165,9 @@
     },
     "mbregex": {
         "type": "builtin",
-        "lib-depends": [
-            "onig"
+        "arg-type": "custom",
+        "ext-depends": [
+            "mbstring"
         ]
     },
     "mbstring": {

src/SPC/builder/extension/mbregex.php

@@ -14,4 +14,9 @@ class mbregex extends Extension
     {
         return 'mbstring';
     }
+
+    public function getConfigureArg(): string
+    {
+        return '';
+    }
 }