fix linker error on Windows : 'unresolved external symbol __imp_DWriteCreateFactory' When using HB_HAVE_DIRECTWRITE=ON then we get linker error: harfbuzz.cc.obj : error LNK2019: unresolved external symbol __imp_DWriteCreateFactory referenced in function "public: __cdecl hb_directwrite_global_t::hb_directwrite_global_t(void)" (??0hb_directwrite_global_t@@QEAA@XZ) Added linking to dwrite.lib on Windows.