Support x86_64-based watchOS simulator target

Author: sbogolepov

build.gradle.kts

@@ -3,7 +3,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.0")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.30-M1")
     }
 }
 

core/build.gradle.kts

@@ -35,6 +35,7 @@ kotlin {
             target("watchosArm32")
             target("watchosArm64")
             target("watchosX86")
+            target("watchosX64")
             target("tvosArm64")
             target("tvosX64")
         }