Fix native implementation

src/nativeMain/kotlin/com.infendro.shell/C.kt

@@ -0,0 +1,17 @@
+package com.infendro.shell
+
+import kotlinx.cinterop.CPointer
+import kotlinx.cinterop.refTo
+import kotlinx.cinterop.toKString
+import platform.posix.FILE
+import platform.posix.fgets
+
+internal fun CPointer<FILE>.readLines(): List<String> {
+    val lines = mutableListOf<String>()
+    val buffer = ByteArray(4096)
+    while (true) {
+        val line = fgets(buffer.refTo(0), buffer.size, this) ?: break
+        lines.add(line.toKString())
+    }
+    return lines
+}