Remove unused ccontext

It was unused, and since the introduction of heap fragments has no
meaningful use.

Signed-off-by: Davide Bettio <[email protected]>

Author: bettio

src/libAtomVM/CMakeLists.txt

@@ -28,7 +28,6 @@ set(HEADER_FILES
     bif.h
     bitstring.h
     context.h
-    ccontext.h
     debug.h
     defaultatoms.h
     dictionary.h