[performance][build] use buildKotlinVersion

kotlin-native/build-tools/settings.gradle.kts

@@ -3,11 +3,13 @@ pluginManagement {
         rootDir.resolve("../gradle.properties").reader().use(::load)
     }
 
+    val buildKotlinCompilerRepo: String by rootProperties
     val kotlinCompilerRepo: String by rootProperties
-    val kotlinVersion by rootProperties
+    val buildKotlinVersion by rootProperties
 
     repositories {
         maven(kotlinCompilerRepo)
+        maven(buildKotlinCompilerRepo)
         maven("https://cache-redirector.jetbrains.com/maven-central")
         mavenCentral()
     }
@@ -15,7 +17,7 @@ pluginManagement {
     resolutionStrategy {
         eachPlugin {
             if (requested.id.id == "kotlin") {
-                useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
+                useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:$buildKotlinVersion")
             }
         }
     }