RasPi5 Alpine Linux vm-display-fbdev build regression

[KenDickey]

SYMPTOM [mvm clean y]

could not find module vm-display-fbdev
Aborted
could not find module vm-display-fbdev
make: *** [Makefile:182: squeak] Aborted
make: *** Deleting file 'squeak'

Directory exists, but Makefile not invoked.

Simple workaround:

## cd vm-display-fbdev
## make
## cd ..
## ./mvm
clean? n

Build then completes.

This was an old behavior which was fixed. Don't know what changed here lately..