Rename module sys_types to sys_types-h. * modules/sys_types-h: Renamed from modules/sys_types. * modules/sys_types-h-tests: Renamed from modules/sys_types-tests. * modules/sys_types-h-c++-tests: Renamed from modules/sys_types-c++-tests. * tests/test-sys_types-h.c: Renamed from tests/test-sys_types.c. * tests/test-sys_types-h-c++.cc: Renamed from tests/test-sys_types-c++.cc. * doc/posix-headers/sys_types.texi: Update. * modules/* (Depends-on): Update. * modules/sys_types: New file.