1.5.4: empty ngram* on Mac OSX

[Alexy Khrabrov]

I've downloaded 1.5.4b a day before release and it built fine.  Now  
was trying to build 1.5.4 and ngram* binaries are size 0.  Am  
investigatng this -- apparently LIBRARY changed to LIBRARIES in some,  
but not all, places in the make files?

/s/src/srilm grep LIBR diff-b2-1.5.4
< $(BINDIR)/%$(EXE_SUFFIX): $(OBJDIR)/%$(OBJ_SUFFIX) $(LIBRARY)
 > $(BINDIR)/%$(EXE_SUFFIX): $(OBJDIR)/%$(OBJ_SUFFIX) $(LIBRARIES)
 > @make binaries depend on all $(LIBRARIES)
< $(BINDIR)/%$(EXE_SUFFIX): $(OBJDIR)/%$(OBJ_SUFFIX) $(LIBRARY)
 > $(BINDIR)/%$(EXE_SUFFIX): $(OBJDIR)/%$(OBJ_SUFFIX) $(LIBRARIES)
 > $(BINDIR)/%$(EXE_SUFFIX): $(OBJDIR)/%$(OBJ_SUFFIX) $(LIBRARY)

Cheers,
Alexy