Typos

[Ken Brown]

There are a few places in the top-level configure.ac and in 
tp/Texinfo/XS/configure.ac where "libintl" is spelled "libinlt".  I 
assume this is unintentional.  It's harmless, AFAICT, because the 
misspellings are done consistently.  But it's confusing to a reader of 
the code.

Ken