Dependency on 'dictionary/pos_matcher.h' from 'session/session_server.cc' is missing in GYP rules

[yukawa]

Environment

• Mozc 2.17.2541.103 (ab513d0) and later

Steps to reproduce

1. python build_mozc.py clean
2. python build_mozc.py gyp
3. python build_mozc.py build -c Release session/session.gyp:session_server

Expected behavior

Build succeeds.

Actual behavior

Build fails with the following error:

mozc_builder@e19b9db170df:~/work/mozc/src$ python build_mozc.py build -c Release session/session.gyp:session_server
INFO: Running: ninja -C out_linux/Release session_server
ninja: Entering directory `out_linux/Release'
[165/186] CXX obj/session/session_server.session_server.o
FAILED: obj/session/session_server.session_server.o 
/usr/bin/clang++ -MMD -MF obj/session/session_server.session_server.o.d -DOS_LINUX -DMOZC_BUILD -DCHANNEL_DEV -DENABLE_GTK_RENDERER -DNDEBUG -DQT_NO_DEBUG -DNO_LOGGING -DIGNORE_HELP_FLAG -DIGNORE_INVALID_FLAG -I/home/mozc_builder/work/mozc/src -Igen -Igen/proto_out -I../../third_party/protobuf/src -Wall -Wno-char-subscripts -Wno-sign-compare -Wno-deprecated-declarations -Wwrite-strings -fPIC -fno-exceptions -fmessage-length=0 -fno-strict-aliasing -funsigned-char -include base/namespace.h -pipe -pthread -fno-omit-frame-pointer -fstack-protector --param=ssp-buffer-size=4 -Wtype-limits -O2 -Wno-deprecated -Wno-covered-switch-default -Wno-unnamed-type-template-args -Wno-c++11-narrowing -std=gnu++0x -std=gnu++0x  -c ../../session/session_server.cc -o obj/session/session_server.session_server.o
In file included from ../../session/session_server.cc:39:
In file included from /home/mozc_builder/work/mozc/src/engine/engine_factory.h:34:
In file included from /home/mozc_builder/work/mozc/src/engine/oss_engine_factory.h:34:
/home/mozc_builder/work/mozc/src/engine/engine.h:39:10: fatal error: 'dictionary/pos_matcher.h' file not found
#include "dictionary/pos_matcher.h"
         ^
1 error generated.

Additional information

This issue is a regression introduced by ab513d0. Since we generate dictionary/pos_matcher.h at build time, the dependency needs to be declared in GYP rules.