tests: Support custom konan.home for platform lib tests

* Move testLibrary tasks from klib into backend.native/tests
 * Support konan.home property in them

backend.native/tests/build.gradle

@@ -62,6 +62,36 @@ allprojects {
     }
 }
 
+def konanHome = rootProject.file(project.findProperty("konan.home") ?: distDir).absolutePath
+def suffix = isWindows() ? ".bat" : ""
+
+// TODO: Ideally we want to write just konanArtifacts{} clause here,
+// but we need to make Kotlin/Native Gradle Plugin a dependence
+// of our buildScripts first.
+task compileKonanTestLibrary(type: Exec) {
+    if (!project.hasProperty("konan.home")) {
+        dependsOn ':dist'
+    }
+
+    def compiler = "$konanHome/bin/konanc$suffix"
+    def source = 'testLibrary'
+    def artifact = 'build/konan/bin/testLibrary'
+
+    executable compiler
+    args source, '-o', artifact, '-p', 'library'
+}
+
+task installTestLibrary(type: Exec) {
+    dependsOn 'compileKonanTestLibrary'
+
+    def tool = "$konanHome/bin/klib$suffix"
+    def repo = "$konanHome/klib/common"
+    def library = 'build/konan/bin/testLibrary.klib'
+
+    executable tool
+    args 'install', library, '-repository', repo
+}
+
 // TODO: use lastSuccessful teamcity build.
 task update_external_tests() {
     doLast {
@@ -1247,7 +1277,7 @@ task link_testLib_explicitly(type: RunStandaloneKonanTest) {
     // there are no testLibrary for cross targets yet.
     disabled = (project.testTarget != null && project.testTarget != project.hostName) 
 
-    dependsOn ':klib:installTestLibrary'
+    dependsOn 'installTestLibrary'
     goldValue = "This is a side effect of a test library linked into the binary.\nYou should not be seeing this.\n\nHello\n"
     source = "link/omit/hello.kt"
     // We force library inclusion, so need to see the warning banner.

klib/build.gradle

@@ -23,33 +23,4 @@ apply plugin: 'kotlin'
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     compile project(path: ':backend.native', configuration: 'cli_bc')
-}
-
-def dist = distDir.absolutePath
-def suffix = isWindows() ? ".bat" : ""
-
-// TODO: Ideally we want to write just konanArtifacts{} clause here,
-// but we need to make Kotlin/Native Gradle Plugin a dependence
-// of our buildScripts first.
-task compileKonanTestLibrary(type: Exec) {
-    dependsOn ':dist'
-
-    def compiler = "$dist/bin/konanc$suffix"
-    def source = 'src/testLibrary'
-    def artifact = 'build/konan/bin/testLibrary'
-
-    executable compiler
-    args source, '-o', artifact, '-p', 'library'
-}
-
-task installTestLibrary(type: Exec) {
-    dependsOn 'compileKonanTestLibrary'
-
-    def tool = "$dist/bin/klib$suffix"
-    def repo = "$dist/klib/common"
-    def library = 'build/konan/bin/testLibrary.klib'
-
-    executable tool
-    args 'install', library, '-repository', repo
-}
-
+}