Add an API to unpack Zip files directly from and to file descriptors.

third_party/zlib/contrib/minizip/ioapi.h

Index: third_party/zlib/contrib/minizip/ioapi.h
diff --git a/third_party/zlib/contrib/minizip/ioapi.h b/third_party/zlib/contrib/minizip/ioapi.h
index 7d457baab34180639d97e82ffdf53d69df5cc6e2..277db9f4533dfd5f0ee96889d979d8e6178b2f70 100644
--- a/third_party/zlib/contrib/minizip/ioapi.h
+++ b/third_party/zlib/contrib/minizip/ioapi.h
@@ -59,6 +59,9 @@ typedef struct zlib_filefunc_def_s
 
 void fill_fopen_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def));
 
+// Google
+void fill_fdopen_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def, const int fd));
+
 #define ZREAD(filefunc,filestream,buf,size) ((*((filefunc).zread_file))((filefunc).opaque,filestream,buf,size))
 #define ZWRITE(filefunc,filestream,buf,size) ((*((filefunc).zwrite_file))((filefunc).opaque,filestream,buf,size))
 #define ZTELL(filefunc,filestream) ((*((filefunc).ztell_file))((filefunc).opaque,filestream))