ld-sh/ld-r-1.d: Disable for sh64*-*-linux*.

ld-sh/ld-r-1.d: Disable for sh64*-*-linux*.
* ld-sh/sh64/sh64.exp: Likewise.
* ld-sh/sh.exp: Disable relaxing tests for sh64*-*-linux*.
* ld-sh/sh64/abi32.sd: Adjust expected output to include
sh64*-*-linux* formats too.
* ld-sh/sh64/relax.exp: Add emul32 variable to hold target
emulation, and set it appropriately for sh*-*-linux*.
* ld-sh/sh64/relfail.exp: Add variables to hold target
emulation, output format, start symbol, and whether target
supports 64-bit ABI.  Set appropriately for sh*-*-linux*.