Sanitizer report incorrect usage of bool accross threads

[mwestphal]

Sanitizer reports incorrect usage of a the quit bool accross threads, which seems to be a correct positive afaics.

I tried adding atomic to the quit bool but then dmon refuse to compile.

==================
150: WARNING: ThreadSanitizer: data race (pid=7868)
150:   Write of size 1 at 0x55aff3fd05f0 by main thread:
150:     #0 dmon_deinit /__w/f3d/f3d/source/external/dmon/dmon.h:1150:16 (f3d+0x172842) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150:     #1 F3DStarter::~F3DStarter() /__w/f3d/f3d/source/application/F3DStarter.cxx:196:3 (f3d+0x1738f7) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150:     #2 main /__w/f3d/f3d/source/application/main.cxx:14:3 (f3d+0x17e7fa) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150: 
150:   Previous read of size 1 at 0x55aff3fd05f0 by thread T1:
150:     #0 _dmon_thread(void*) /__w/f3d/f3d/source/external/dmon/dmon.h:1055:19 (f3d+0x171231) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150: 
150:   Location is global '_dmon' of size 840 at 0x55aff3fd02b0 (f3d+0x15c25f0)
150: 
150:   Thread T1 (tid=7872, running) created by main thread at:
150:     #0 pthread_create <null> (f3d+0x64e4d) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150:     #1 dmon_init /__w/f3d/f3d/source/external/dmon/dmon.h:1137:13 (f3d+0x1736e4) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150:     #2 F3DStarter::F3DStarter() /__w/f3d/f3d/source/application/F3DStarter.cxx:189:3 (f3d+0x1736e4)
150:     #3 main /__w/f3d/f3d/source/application/main.cxx:12:16 (f3d+0x17e7e1) (BuildId: 2788a4d430378bd83bc4b94da37bf9dff66918f4)
150: 
150: SUMMARY: ThreadSanitizer: data race /__w/f3d/f3d/source/external/dmon/dmon.h:1150:16 in dmon_deinit
150: ==================