Added #include <cstdio> for perror.

file.cpp lost indirect inclusion via #include <ext/stdio_filebuf.h> on the previous commit.
Commenting-out a test.

I removed jubatus::util::data::serialization::stream's default constructor for libc++ at 8ce7ca7b37d4ee24168e65e549ee9a4afbfccb31.
jubatus::util::data::serialization::stream's default constructor should be added soon.