Support importing string literal macros with cinterop

backend.native/tests/interop/basics/macros.kt

@@ -0,0 +1,19 @@
+import kotlin.test.*
+import cmacros.*
+
+fun main(args: Array<String>) {
+    assertEquals("foo", FOO_STRING)
+    assertEquals(0, ZERO)
+    assertEquals(1, ONE)
+    assertEquals(Long.MAX_VALUE, MAX_LONG)
+    assertEquals(42, FOURTY_TWO)
+
+    val seventeen: Long = SEVENTEEN
+    assertEquals(17L, seventeen)
+
+    val onePointFive: Float = ONE_POINT_FIVE
+    val onePointZero: Double = ONE_POINT_ZERO
+
+    assertEquals(1.5f, onePointFive)
+    assertEquals(1.0, onePointZero)
+}