[tlbuild] texlinks fails because of missing fmtutil.cnf

[Jonathan Kew]

I notice that fmtutil.cnf is no longer created in the inst directory  
during Build. This in turn means that texlinks fails during the "make  
install" stage (texlinks: config file `fmtutil.cnf' not found.), and  
symlinks to the engines are not created for the various formats like  
latex, pdflatex, xelatex, etc.

Is this deliberate, because those links will now be added at some  
other stage, or do we need to restore the build-time fmtutil.cnf  
(even if it's not going to be used in the "real" installation) so  
that the proper links are created?

Obviously, I could work around this by putting a fmtutil.cnf file  
somewhere suitable, but the Build process shouldn't depend on that.

JK