Suppress "runtime JAR files version mismatch" warnings in some plugins

libraries/tools/kotlin-allopen/build.gradle

@@ -26,7 +26,7 @@ dependencies {
 tasks.withType(project.compileKotlin.class) {
     kotlinOptions.languageVersion = "1.3"
     kotlinOptions.apiVersion = "1.3"
-    kotlinOptions.freeCompilerArgs += ["-Xskip-prerelease-check"]
+    kotlinOptions.freeCompilerArgs += ["-Xskip-prerelease-check", "-Xskip-runtime-version-check"]
 }
 
 jar {

libraries/tools/kotlin-noarg/build.gradle

@@ -32,7 +32,7 @@ dependencies {
 tasks.withType(project.compileKotlin.class) {
     kotlinOptions.languageVersion = "1.3"
     kotlinOptions.apiVersion = "1.3"
-    kotlinOptions.freeCompilerArgs += ["-Xskip-prerelease-check"]
+    kotlinOptions.freeCompilerArgs += ["-Xskip-prerelease-check", "-Xskip-runtime-version-check"]
 }
 
 jar {

libraries/tools/kotlin-sam-with-receiver/build.gradle

@@ -32,7 +32,7 @@ dependencies {
 tasks.withType(project.compileKotlin.class) {
     kotlinOptions.languageVersion = "1.3"
     kotlinOptions.apiVersion = "1.3"
-    kotlinOptions.freeCompilerArgs += ["-Xskip-prerelease-check"]
+    kotlinOptions.freeCompilerArgs += ["-Xskip-prerelease-check", "-Xskip-runtime-version-check"]
 }
 
 jar {

libraries/tools/kotlin-serialization/build.gradle

@@ -23,6 +23,10 @@ dependencies {
     embedded(project(":kotlinx-serialization-compiler-plugin")) { transitive = false }
 }
 
+tasks.withType(project.compileKotlin.class) {
+    kotlinOptions.freeCompilerArgs += ["-Xskip-runtime-version-check"]
+}
+
 jar {
     manifestAttributes(manifest, project)
 }

plugins/pill/pill-importer/build.gradle.kts

@@ -46,4 +46,10 @@ val pill by tasks.creating {
 val unpill by tasks.creating {
     dependsOn(jar)
     doLast { runPillTask("unpill") }
-}
+}
+
+tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>> {
+    kotlinOptions {
+        freeCompilerArgs = freeCompilerArgs + "-Xskip-runtime-version-check"
+    }
+}