Update debian/copyright

In debian/copyright,

1. The file says

Portions of the following files are licensed under the MIT License:

lib/erl/src/Makefile.am

but there is no Makefile.am in lib/erl/src/.

Instead, there exists lib/erl/Makefile.am.

2. These paths need to be checked and updated.

?? compiler/cpp/Makefile.am??
?? compiler/cpp/src/generate/t_cpp_generator.cc??
?? compiler/cpp/src/generate/t_netstd_generator.cc??
?? compiler/cpp/src/generate/t_erl_generator.cc??
?? compiler/cpp/src/generate/t_hs_generator.cc??
?? compiler/cpp/src/generate/t_java_generator.cc??
?? compiler/cpp/src/generate/t_ocaml_generator.cc??
?? compiler/cpp/src/generate/t_perl_generator.cc??
?? compiler/cpp/src/generate/t_php_generator.cc??
?? compiler/cpp/src/generate/t_py_generator.cc??
?? compiler/cpp/src/generate/t_rb_generator.cc??
?? compiler/cpp/src/generate/t_st_generator.cc??
?? compiler/cpp/src/generate/t_xsd_generator.cc??
?? compiler/cpp/src/main.cc??
?? compiler/cpp/src/parse/t_field.h??
?? compiler/cpp/src/parse/t_program.h??
?? compiler/cpp/src/platform.h??
?? compiler/cpp/src/thriftl.ll??
?? compiler/cpp/src/thrifty.yy??
?? lib/netstd/src/Protocol/TBinaryProtocol.cs??
?? lib/netstd/src/Protocol/TField.cs??
?? lib/netstd/src/Protocol/TList.cs??
?? lib/netstd/src/Protocol/TMap.cs??
?? lib/netstd/src/Protocol/TMessage.cs??
?? lib/netstd/src/Protocol/TMessageType.cs??
?? lib/netstd/src/Protocol/TProtocol.cs??
?? lib/netstd/src/Protocol/TProtocolException.cs??
?? lib/netstd/src/Protocol/TProtocolFactory.cs??
?? lib/netstd/src/Protocol/TProtocolUtil.cs??
?? lib/netstd/src/Protocol/TSet.cs??
?? lib/netstd/src/Protocol/TStruct.cs??
?? lib/netstd/src/Protocol/TType.cs??
?? lib/netstd/src/Server/TServer.cs??
?? lib/netstd/src/Server/TSimpleServer.cs??
?? lib/netstd/src/Server/TThreadPoolServer.cs??
?? lib/netstd/src/TApplicationException.cs??
?? lib/netstd/src/Thrift.csproj??
?? lib/netstd/src/Thrift.sln??
?? lib/netstd/src/TProcessor.cs??
?? lib/netstd/src/Transport/TServerSocket.cs??
?? lib/netstd/src/Transport/TServerTransport.cs??
?? lib/netstd/src/Transport/TSocket.cs??
?? lib/netstd/src/Transport/TStreamTransport.cs??
?? lib/netstd/src/Transport/TTransport.cs??
?? lib/netstd/src/Transport/TTransportException.cs??
?? lib/netstd/src/Transport/TTransportFactory.cs??
?? lib/netstd/ThriftMSBuildTask/Properties/AssemblyInfo.cs??
?? lib/netstd/ThriftMSBuildTask/ThriftBuild.cs??
?? lib/netstd/ThriftMSBuildTask/ThriftMSBuildTask.csproj??
?? lib/rb/lib/thrift.rb??
?? lib/st/README??
?? lib/st/thrift.st??
?? test/OptionalRequiredTest.cpp??
?? test/OptionalRequiredTest.thrift??
?? test/ThriftTest.thrift??

3. The file says

For the compiler/cpp/src/md5.[ch] components:

but there is no md5-related file in compiler/cpp/src/.

4. The file says

For the lib/rb/setup.rb: Copyright (c) 2000-2005 Minero Aoki,

but there is no setup.rb file in lib/rb/.

5. The file says

lib/ocaml/OCamlMakefile and lib/ocaml/README-OCamlMakefile components:

but both files do not exist.

6. The file says

(see doc/lgpl-2.1.txt for the full terms of this license)

but the correct path is doc/licenses/lgpl-2.1.txt.

Please see doc/otp-base-license.txt for the full terms of this license.

but the correct path is doc/licenses/otp-base-license.txt.

The following files contain some portions of code contributed under
the Thrift Software License (see doc/old-thrift-license.txt), and relicensed
under the Apache 2.0 License:

but cannot find old-thrift-license.txt file in doc/ or doc/licenses.