Add file_descriptor.cpp and mapped_file.cpp to the list of compiled

files.

Patch from Takeshi Mouri.


[SVN r37396]

libs/iostreams

@@ -1 +1 @@
-Subproject commit 356ab3d25694314a435bb9ebc52f07fa5e56a5cd
+Subproject commit b7c36db71c6b9b6ffeca256e4b07cd718658a92b