win32 sample uses platform.windows (#940)

samples/win32/build.bat

@@ -6,5 +6,4 @@ if "%TARGET%" == "" set TARGET=mingw
 
 set "LFLAGS=-Wl,--subsystem,windows"
 
-call cinterop -def "%DIR%\src\main\c_interop\win32.def" -target "%TARGET%" -o win32 || exit /b
-call konanc -target "%TARGET%" "%DIR%\src\main\kotlin\MessageBox.kt" -library win32 -linkerOpts "%LFLAGS%" -opt -o MessageBox || exit /b
+call konanc -target "%TARGET%" "%DIR%\src\main\kotlin\MessageBox.kt" -linkerOpts "%LFLAGS%" -opt -o MessageBox || exit /b

samples/win32/src/main/c_interop/win32.def

@@ -1,3 +0,0 @@
-headers = windows.h
-headerFilter = win**.h
-compilerOpts = -DUNICODE -Wno-incompatible-pointer-types -Wno-deprecated-declarations

samples/win32/src/main/kotlin/MessageBox.kt

@@ -1,6 +1,6 @@
-import win32.*
+import platform.windows.*
 
 fun main(args: Array<String>) {
     MessageBoxW(null, "Konan говорит:\nЗДРАВСТВУЙ МИР!\n",
             "Заголовок окна", MB_YESNOCANCEL or MB_ICONQUESTION)
-}
+}