Add ftmm.c to FreeType build.

The FreeType configuration is already building with
TT_CONFIG_OPTION_GX_VAR_SUPPORT, but the functions cannot be accessed
without base/ftmm.c. The ftmm.c file is small and simply exposes the
means to call the service which already exists on the ft_face.

Change-Id: I35cab20abd0194df1c5be7b0ebb09cc8c260a470
1 file changed