This test requires the following locale to be available: fr_FR.utf8

The Haskell part of the program sets LC_ALL to fr_FR, allocates for a
bit to cause one GC, and outputs a number to make use of the locale
it set up earlier.

The Makefile compiles, runs and checks the Haskell program's output;
verifies that we do have all three cases of localized samples in the
.hp file, and runs hp2ps on it.

This ought to ensure:
* libc locales still working as intended on the user's side
* .hp samples are readable to hp2ps