Make AbstractJvmAbiContentTest system independent

plugins/jvm-abi-gen/test/org/jetbrains/kotlin/jvm/abi/AbstractJvmAbiContentTest.kt

@@ -1,5 +1,6 @@
 package org.jetbrains.kotlin.jvm.abi
 
+import com.intellij.openapi.util.io.systemIndependentPath
 import org.jetbrains.kotlin.codegen.BytecodeListingTextCollectingVisitor
 import org.jetbrains.kotlin.incremental.isClassFile
 import org.jetbrains.kotlin.jvm.abi.asm.ABI_EXTENSION_ASM_API_VERSION
@@ -28,7 +29,7 @@ abstract class AbstractJvmAbiContentTest : BaseJvmAbiTest() {
         }
 
         val actual = classToBytecode.entries
-            .sortedBy { it.key.relativeTo(baseDir) }
+            .sortedBy { it.key.relativeTo(baseDir).systemIndependentPath }
             .joinToString("\n") { it.value }
         val signaturesFile = testDir.resolve("signatures.txt")
         if (!signaturesFile.exists()) {