[RFA] toplevel: Always use in tree makeinfo in texinfo subdir

[Paolo Bonzini]

> +USUAL_MAKEINFO = `if [ -f $$r/texinfo/makeinfo/makeinfo ] || pwd | grep /texinfo$ > /dev/null ; \

You should at least quote '/texinfo$'.

You may also look into supporting extra_configure_flags and 
extra_make_flags Autogen variables for modules.  Then just define them 
to USUAL_MAKEINFO="$$r/texinfo/makeinfo/makeinfo".

Maybe this will allow major cleanups WRT the way gcc is handled in the 
toplevel Makefile, so it is worth considering it.

Paolo