Library directories for tilegx

[Joseph Myers]

TileGX GCC believes that 64-bit libraries go in lib/ and 32-bit libraries 
and dynamic linker go in lib32/.  But the glibc port does not use 
LIBC_SLIBDIR_RTLDDIR in the 32-bit case, meaning that both get installed 
in lib/ and building a biarch GCC blows up (as found when making my 
build-many-glibcs.py script support building all GNU/Linux glibc ABIs).  
What is the correct set of directories to use?

-- 
Joseph S. Myers
joseph@codesourcery.com