ipodpatcher: guard platform specific files.

Use the preprocessor to make platform specific files compile as empty files if
built for a different platform. This removes the need to distinguish in the
Makefile and simplifies creating a libipodpatcher.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31169 a1c6a512-1295-4272-9138-f99709370657
diff --git a/rbutil/ipodpatcher/ipodio-win32-scsi.c b/rbutil/ipodpatcher/ipodio-win32-scsi.c
index c87be72..7e338ac 100644
--- a/rbutil/ipodpatcher/ipodio-win32-scsi.c
+++ b/rbutil/ipodpatcher/ipodio-win32-scsi.c
@@ -49,6 +49,7 @@
  *
  ****************************************************************************/
 
+#if defined(_WIN32)
 #include <windows.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -119,3 +120,5 @@
         return -1;
     }
 }
+#endif
+