[build] Move shared and gradle-plugin into separate gradle builds

Platform libs build will be changed by a separate commit

backend.native/build.gradle

@@ -147,10 +147,10 @@ dependencies {
     compilerCompile kotlinCompilerModule
     compilerCompile kotlinNativeInterop['llvm'].configuration
     compilerCompile kotlinNativeInterop['hash'].configuration
-    compilerCompile project(':shared')
+    compilerCompile 'org.jetbrains.kotlin:kotlin-native-shared'
 
     cli_bcCompile "org.jetbrains.kotlin:kotlin-runtime:$buildKotlinVersion"
-    cli_bcCompile project(':shared')
+    cli_bcCompile 'org.jetbrains.kotlin:kotlin-native-shared'
     cli_bcCompile sourceSets.compiler.output
 
     bc_frontendCompile kotlinCompilerModule

backend.native/debugger-tests/build.gradle

@@ -4,7 +4,7 @@ apply plugin: 'kotlin'
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib:$buildKotlinVersion"
     compile project(path: ':backend.native', configuration: 'cli_bc')
-    compile project(':shared')
+    compile 'org.jetbrains.kotlin:kotlin-native-shared'
     compile 'junit:junit:4.12'
 }