[arch-haskell] Error messages from FindCLibs

[Don Stewart]

remy:
> The FindCLibs function in cabal2arch (which I want to include in the
> archlinux library) report errors for non-Haskell dependencies it
> cannot translate into ArchLinux package names. Batch running
> cabal2arch can find some missing items : I attached a list of
> candidates.
> 
> We basically have to run "pkgfile lib$i.so" for $i in this file
> (pkgfile is a script from the pkgtools package) to know the package
> name corresponding to a library name.

Note that currently it will also warn if the name is correct. I.e. the
user specifies "gsl" and that does correspond to "gsl" on Arch: you
still get a warning.