Fix compiller issues

[CCnut]

gcc version 11.2.0 (Rev2, Built by MSYS2 project)

[1/6] Building CXX object smbios/src/CMakeFiles/smbios.dir/win_system_information.cpp.obj
FAILED: smbios/src/CMakeFiles/smbios.dir/win_system_information.cpp.obj
C:\msys64\mingw64\bin\c++.exe  -ID:/source/repos/SmbiosUtil/smbios/src/../include -std=c++11 -std=gnu++1y -pthread -fPIC -MD -MT smbios/src/CMakeFiles/smbios.dir/win_system_information.cpp.obj -MF smbios\src\CMakeFiles\smbios.dir\win_system_information.cpp.obj.d -o smbios/src/CMakeFiles/smbios.dir/win_system_information.cpp.obj -c D:/source/repos/SmbiosUtil/smbios/src/win_system_information.cpp
In file included from D:/source/repos/SmbiosUtil/smbios/src/win_system_information.cpp:2:
D:/source/repos/SmbiosUtil/smbios/include/smbios/win_system_information.h:108:17: error: field 'cpu_architecture_' has incomplete type 'std::string' {aka 'std::__cxx11::basic_string<char>'}
  108 |     std::string cpu_architecture_;
      |                 ^~~~~~~~~~~~~~~~~
In file included from C:/msys64/mingw64/include/c++/11.2.0/iosfwd:39,
                 from C:/msys64/mingw64/include/c++/11.2.0/bits/shared_ptr.h:52,
                 from C:/msys64/mingw64/include/c++/11.2.0/memory:77,
                 from D:/source/repos/SmbiosUtil/smbios/include/smbios/win_system_information.h:2,
                 from D:/source/repos/SmbiosUtil/smbios/src/win_system_information.cpp:2:
C:/msys64/mingw64/include/c++/11.2.0/bits/stringfwd.h:74:11: note: declaration of 'std::string' {aka 'class std::__cxx11::basic_string<char>'}
   74 |     class basic_string;
      |           ^~~~~~~~~~~~

add #include <string> to https://github.com/yuchdev/SmbiosUtil/blob/5353277e6d1a4a248846872e2ce2c72d060f0650/smbios/include/smbios/win_system_information.h#L1 can solve the problem.