Remove jsIrDist (kotlin.stdlib.js.ir.dist) flag and the logic it enables

It is no longer needed since JS IR is published in JS artifacts,
and there's no longer separate "-js-ir" artifacts.

Changes in BuildProperties.kt will take effect after the next
kotlin-build-gradle-plugin publishing.

dependencies/kotlin-build-gradle-plugin/src/BuildProperties.kt

@@ -81,8 +81,6 @@ class KotlinBuildProperties(
 
     val proguard: Boolean get() = postProcessing && getBoolean("kotlin.build.proguard", isTeamcityBuild)
 
-    val jsIrDist: Boolean get() = getBoolean("kotlin.stdlib.js.ir.dist")
-
     val jarCompression: Boolean get() = getBoolean("kotlin.build.jar.compression", isTeamcityBuild)
 
     val buildCacheUrl: String? = get("kotlin.build.cache.url") as String?