[K/N][tests] Move gradle stuff for old infra to old infra

kotlin-native/backend.native/tests/build.gradle

@@ -20,6 +20,43 @@ buildscript {
     }
 }
 
+void loadLocalProperties() {
+    if (new File("$project.rootDir/local.properties").exists()) {
+        Properties props = new Properties()
+        props.load(new FileInputStream("$project.rootDir/local.properties"))
+        props.each { prop -> project.ext.set(prop.key, prop.value) }
+    }
+}
+
+void loadCommandLineProperties() {
+    if (project.hasProperty("konanc_flags")) {
+        throw new Error("Specify either -Ptest_flags or -Pbuild_flags.")
+    }
+
+    ext.globalBuildArgs = new ArrayList<String>()
+    if (project.hasProperty("build_flags")) {
+        for (String flag : ext.build_flags.toString().split("\\s")) {
+            flag = flag.trim()
+            if (!flag.isEmpty()) ext.globalBuildArgs.add(flag)
+        }
+    }
+
+    ext.globalTestArgs = new ArrayList<String>()
+    ext.globalTestArgs.add("-Xpartial-linkage=enable")
+    ext.globalTestArgs.add("-Xpartial-linkage-loglevel=error")
+    if (project.hasProperty("test_flags")) {
+        for (String flag : ext.test_flags.toString().split("\\s")) {
+            flag = flag.trim()
+            if (!flag.isEmpty()) ext.globalTestArgs.add(flag)
+        }
+    }
+
+    ext.testTarget = project.hasProperty("test_target") ? ext.test_target : PlatformInfo.hostName
+}
+
+loadCommandLineProperties()
+loadLocalProperties()
+
 apply plugin: 'konan'
 apply plugin: 'kotlin'
 apply plugin: 'kotlin.native.build-tools-conventions'
@@ -1235,7 +1272,7 @@ dynamicTest("interop_kotlin_exception_hook") {
 }
 
 standaloneTest("kt51302") {
-    enabled = project.target.name == project.hostName
+    enabled = project.target.name == PlatformInfo.hostName
     source = "serialization/KT-51302/main.kt"
     flags = ["-l", "$projectDir/serialization/KT-51302/kt51302_dependency"]
 }