[sugar] [PATCH] Fix regeneration of ./configure from configure.ac when using make

[Marco Pesenti Gritti]

Looks good to me, please push it (feel free to push on trial-2 too but
I don't think it's strictly necessary, I don't think a lot of work
will go into it).

For sugar patches, in the future please follow
http://wiki.laptop.org/go/Sugar_Patches

Thanks!
Marco