A sketch whose only LVGL include was <lvgl.h> died on a wall of errors from
Adafruit LvGL Glue, a library it never included. LVGL's sources carry
`#include "lv_conf.h"` behind `#if !LV_CONF_SKIP`; the include scan is
textual and does not evaluate that guard, so the header was queued even for a
build defining LV_CONF_SKIP=1, resolved against the shared library dir, and
found the copy the glue library vendors for LVGL v7. That merged the whole
library, whose sources then failed against the LVGL v8 actually in use
('lv_fs_drv_t' has no member named 'user_data').
Same failure shape as the Hash.h -> stemihexapod case already documented
next to it, so the fix is the same: a project-supplied config header never
resolves against user libraries. A project shipping its own lv_conf.h is
unaffected (sketch files are found in the build's own source dir), and a
project that really wants the glue library still reaches it by including
its own header.
467cf108ff