Use packages specified in .def files for platform libs

backend.native/tests/link/default/default.kt

@@ -1,4 +1,4 @@
-import posix.*
+import platform.posix.*
 
 fun main(args: Array<String>) {
     // Just check the typealias is in scope.

klib/platform.gradle

@@ -15,7 +15,6 @@ List<String> libraries = gradle.startParameter.projectProperties.libraries.split
 konanInterop {
     "$taskName" {
         defFile gradle.startParameter.projectProperties.defFile
-        pkg gradle.startParameter.projectProperties.name
         target gradle.startParameter.projectProperties.target
         noDefaultLibs true
         extraOpts libraries.collectMany { ["-library",  "$konanHome/klib/$it"] }

samples/csvparser/src/main/kotlin/CsvParser.kt

@@ -15,7 +15,7 @@
  */
 
 import kotlinx.cinterop.*
-import posix.*
+import platform.posix.*
 
 fun parseLine(line: String, separator: Char) : List<String> {
     val result = mutableListOf<String>()

samples/nonBlockingEchoServer/src/main/kotlin/EchoServer.kt

@@ -15,7 +15,7 @@
  */
 
 import kotlinx.cinterop.*
-import posix.*
+import platform.posix.*
 import kotlin.coroutines.experimental.*
 import kotlin.coroutines.experimental.intrinsics.*
 

samples/socket/src/main/kotlin/EchoServer.kt

@@ -15,7 +15,7 @@
  */
 
 import kotlinx.cinterop.*
-import posix.*
+import platform.posix.*
 
 fun main(args: Array<String>) {
     if (args.size < 1) {