Fix compiling under Windows

`createSymbolicLink` documents that it may fail with
UnsupportedOperationException on OS where symbolic links cannot be used,
but it turns out that in practice it fails with FileSystemException on
Windows when you don't have enough privileges to create symbolic links.

Author: smarter

project/Build.scala

@@ -3,7 +3,7 @@ import sbt._
 import complete.DefaultParsers._
 import java.io.{File, RandomAccessFile}
 import java.nio.channels.FileLock
-import java.nio.file.Files
+import java.nio.file.{ Files, FileSystemException }
 import java.util.Calendar
 
 import scala.reflect.io.Path
@@ -407,7 +407,7 @@ object Build {
               Files.createSymbolicLink(/*link = */ dst.toPath, /*existing = */src.toPath)
           }
         } catch {
-          case e: UnsupportedOperationException =>
+          case _: UnsupportedOperationException | _: FileSystemException =>
             // If the OS doesn't support symbolic links, copy the directory instead.
             sbt.IO.copy(pairs, overwrite = true, preserveLastModified = true)
         }