Disable Scala Native build for kernel (#2565)

Scalacheck hasn't published artifact for Scala Native yet and that cause
problems with indexing project in Intellij. Plan is to temporarily
disable Scala Native cross project until artifact will be available at
typelevel/scalacheck#396
fixes #2559

build.sbt

@@ -390,7 +390,7 @@ lazy val macros = crossProject(JSPlatform, JVMPlatform)
 lazy val macrosJVM = macros.jvm
 lazy val macrosJS = macros.js
 
-lazy val kernel = crossProject(JSPlatform, JVMPlatform, NativePlatform)
+lazy val kernel = crossProject(JSPlatform, JVMPlatform)
   .crossType(CrossType.Pure)
   .in(file("kernel"))
   .settings(moduleName := "cats-kernel", name := "Cats kernel")
@@ -401,12 +401,10 @@ lazy val kernel = crossProject(JSPlatform, JVMPlatform, NativePlatform)
   .settings(includeGeneratedSrc)
   .jsSettings(commonJsSettings)
   .jvmSettings(commonJvmSettings ++ mimaSettings("cats-kernel"))
-  .nativeSettings(commonNativeSettings)
   .settings(libraryDependencies += "org.scalacheck" %%% "scalacheck" % scalaCheckVersion(scalaVersion.value) % "test")
 
 lazy val kernelJVM = kernel.jvm
 lazy val kernelJS = kernel.js
-lazy val kernelNative = kernel.native
 
 lazy val kernelLaws = crossProject(JSPlatform, JVMPlatform)
   .crossType(CrossType.Pure)