Build: remove obsolete -Xir-binary-with-stable-abi

It's no longer needed after eef06cded3 and 3e3ffee2a0.

build.gradle.kts

@@ -445,7 +445,6 @@ allprojects {
 
             if (useJvmIrBackend) {
                 useIR = true
-                freeCompilerArgs += "-Xir-binary-with-stable-abi"
             }
         }
     }

libraries/commonConfiguration.gradle

@@ -198,12 +198,7 @@ ext.configureLegacyPublishing = { Project project ->
 ext.configureJvmIrBackend = { Project project ->
     project.tasks.withType(KotlinCompile.class) { task ->
         task.kotlinOptions {
-            if (project.kotlinBuildProperties.useIRForLibraries) {
+            useIR = project.kotlinBuildProperties.useIRForLibraries
-                useIR = true
-                freeCompilerArgs += ["-Xir-binary-with-stable-abi"]
-            } else {
-                useIR = false
-            }
         }
     }
 }