no-PCH build is broken

[r4d1sh]

ElunaTrinityWotlk no-PCH build is broken:

src/server/game/LuaEngine/ElunaConfig.cpp:96:24: fatal error: implicit instantiation of undefined template 'std::basic_istringstream'
[build] 96 | std::istringstream maps(GetConfig(CONFIG_ELUNA_ONLY_ON_MAPS));
[build] | ^
[build] /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/iosfwd:102:11: note: template is declared here
[build] 102 | class basic_istringstream;
[build] | ^
[build] 1 error generated.
[build] gmake[2]: *** [src/server/game/CMakeFiles/game.dir/build.make:2330: src/server/game/CMakeFiles/game.dir/LuaEngine/ElunaConfig.cpp.o] Error 1
[build] gmake[2]: *** Waiting for unfinished jobs....

[Foereaper]

Should be fixed as of 7008e06, but there might be issues elsewhere. I don't run tests on no-pch by default.