[Bug]: OpenTTD doesn't cleanly exit when no graphics set are found

[planetmaker]

Version of OpenTTD

7145b70 (master/HEAD)

Expected result

I expected OpenTTD to complain about missing base graphics and exit cleanly or to offer downloading them

Actual result

OpenTTD remained in limbo:

[planetmaker:~/ottd/openttd/build] [base] master* ± git show
commit 7145b7060aa00c3dbd60e05c51d7c275f016f825 (HEAD -> master, origin/master, origin/HEAD)
[planetmaker:~/ottd/openttd/build] [base] master* ± ./openttd 
Error: Failed to find a graphics set. Please acquire a graphics set for OpenTTD. See section 1.4 of README.md.
warning: queue 0x4955220 destroyed while proxies still attached:
  wl_callback@44 still attached
  wl_surface@42 still attached

(but it didn't exit)

Backtrace as follows:

futex_wait (private=<optimized out>, expected=12, futex_word=0x27a4ae4 <_http_cv+36>) at ../sysdeps/nptl/futex-internal.h:146
Downloading source file /usr/src/debug/glibc-2.38-4.fc39.x86_64/nptl/../sysdeps/nptl/futex-internal.h
146       int err = lll_futex_timed_wait (futex_word, expected, NULL, private);                                                                            
(gdb) bt
#0  futex_wait (private=<optimized out>, expected=12, futex_word=0x27a4ae4 <_http_cv+36>) at ../sysdeps/nptl/futex-internal.h:146
#1  futex_wait_simple (private=<optimized out>, expected=12, futex_word=0x27a4ae4 <_http_cv+36>) at ../sysdeps/nptl/futex-internal.h:177
#2  __GI___pthread_cond_destroy (cond=0x27a4ac0 <_http_cv>) at pthread_cond_destroy.c:53
#3  0x00007f30ffadc13d in __gthread_cond_destroy (__cond=<optimized out>)
    at /usr/src/debug/gcc-13.2.1-3.fc39.x86_64/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/x86_64-redhat-linux/bits/gthr-default.h:885
#4  std::__condvar::~__condvar() (this=<optimized out>, __in_chrg=<optimized out>)
    at /usr/src/debug/gcc-13.2.1-3.fc39.x86_64/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/std_mutex.h:157
#5  std::condition_variable::~condition_variable() (this=<optimized out>, __in_chrg=<optimized out>)
    at ../../../../../libstdc++-v3/src/c++11/condition_variable.cc:36
#6  0x00007f30ff85efd6 in __run_exit_handlers
    (status=1, listp=<optimized out>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:111
#7  0x00007f30ff85f11e in __GI_exit (status=<optimized out>) at exit.c:141
#8  0x0000000001715a47 in UserErrorI(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
    (str="Failed to find a graphics set. Please acquire a graphics set for OpenTTD. See section 1.4 of README.md.")
    at /home/planetmaker/ottd/openttd/src/openttd.cpp:124
#9  0x000000000143c89b in HandleBootstrap() () at /home/planetmaker/ottd/openttd/src/bootstrap_gui.cpp:421
#10 0x00000000017184ef in openttd_main(int, char**) (argc=1, argv=0x7ffcacf88748) at /home/planetmaker/ottd/openttd/src/openttd.cpp:753
#11 0x0000000000e84754 in main(int, char**) (argc=1, argv=0x7ffcacf88748) at /home/planetmaker/ottd/openttd/src/os/unix/unix_main.cpp:32

Steps to reproduce

clone OpenTTD master
Have all dependencies except (what is that btw?)

CMake Warning at CMakeLists.txt:138 (find_package):
  By not providing "Findunofficial-breakpad.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "unofficial-breakpad", but CMake did not find one.

  Could not find a package configuration file provided by
  "unofficial-breakpad" with any of the following names:

    unofficial-breakpadConfig.cmake
    unofficial-breakpad-config.cmake

  Add the installation prefix of "unofficial-breakpad" to CMAKE_PREFIX_PATH
  or set "unofficial-breakpad_DIR" to a directory containing one of the above
  files.  If "unofficial-breakpad" provides a separate development package or
  SDK, be sure it has been installed.

Compile OpenTTD and start it.

[planetmaker]

Right, fontconfig was missing. Adding that... a window actually opens

[rubidium42]

Fixed by #11398.