Add Windows i18n support (#617)

backend.native/build.gradle

@@ -157,8 +157,9 @@ targetList.each { target ->
         classpath = project.configurations.cli_bc
         jvmArgs "-ea", 
             "-Dkonan.home=${project.parent.file('dist')}",
-            "-Djava.library.path=${project.buildDir}/nativelibs"
-        args('-output', project(':runtime').file("build/${target}Stdlib"), 
+            "-Djava.library.path=${project.buildDir}/nativelibs",
+            "-Dfile.encoding=UTF-8"
+        args('-output', project(':runtime').file("build/${target}Stdlib"),
             '-nopack', '-nostdlib','-ea',
             '-produce', 'library', '-target', target,
             '-runtime', project(':runtime').file("build/${target}/runtime.bc"),

backend.native/tests/build.gradle

@@ -367,17 +367,14 @@ task hello3(type: RunKonanTest) {
 }
 
 task hello4(type: RunKonanTest) {
-    if (isWindows()) {
-        // To be investigated.
-        disabled = true
-    }
     goldValue = "Hello\nПока\n"
     source = "runtime/basic/hello4.kt"
 }
 
 task tostring0(type: RunKonanTest) {
     if (isWindows()) {
-        // To be investigated.
+        // ト is misprinted for now (as 0x3f).
+        // TODO: investigate.
         disabled = true
     }
     goldValue = "127\n-1\n239\nA\nЁ\nト\n1122334455\n112233445566778899\n3.14159265358\n1.0E27\n1.0E-300\ntrue\nfalse\n"
@@ -395,10 +392,6 @@ task tostring2(type: RunKonanTest) {
 }
 
 task tostring3(type: RunKonanTest) {
-    if (isWindows()) {
-        // Double.toString()
-        disabled = true
-    }
     goldValue = "-128\n127\n-32768\n32767\n" +
             "-2147483648\n2147483647\n-9223372036854775808\n9223372036854775807\n" +
             "1.4E-45\n3.4028235E38\n-Infinity\nInfinity\n" +
@@ -1223,19 +1216,11 @@ task moderately_large_array1(type: RunKonanTest) {
 }
 
 task string_builder0(type: RunKonanTest) {
-    if (isWindows()) {
-        // To be investigated.
-        disabled = true
-    }
     goldValue = "OK\n"
     source = "runtime/text/string_builder0.kt"
 }
 
 task string0(type: RunKonanTest) {
-    if (isWindows()) {
-        // To be investigated.
-        disabled = true
-    }
     goldValue = "true\ntrue\nПРИВЕТ\nпривет\nПока\ntrue\n"
     source = "runtime/text/string0.kt"
 }