x11/hyprcursor: unbreak build after 06c18b031f1d

hyprcursor-util/src/main.cpp:260:19: error: implicit instantiation of undefined template 'std::basic_ofstream<char>'

260 |     std::ofstream manifest(out + "/manifest.hl", std::ios::trunc);
    |                   ^

/usr/include/c++/v1/__fwd/fstream.h:26:28: note: template is declared here

26 | class _LIBCPP_TEMPLATE_VIS basic_ofstream;
   |                            ^

hyprcursor-util/src/main.cpp:292:41: error: implicit instantiation of undefined template 'std::basic_ifstream<char>'

292 |         std::ifstream                   xconfig("/tmp/hyprcursor-util/" + xcursor.path().stem().string() + ".conf");
    |                                         ^

/usr/include/c++/v1/__fwd/fstream.h:24:28: note: template is declared here

24 | class _LIBCPP_TEMPLATE_VIS basic_ifstream;
   |                            ^

hyprcursor-util/src/main.cpp:370:23: error: implicit instantiation of undefined template 'std::basic_ofstream<char>'

370 |         std::ofstream meta(CURSORDIR + "/meta.hl", std::ios::trunc);
    |                       ^

/usr/include/c++/v1/__fwd/fstream.h:26:28: note: template is declared here

26 | class _LIBCPP_TEMPLATE_VIS basic_ofstream;
   |                            ^

Reported by: pkg-fallout