cris: Remove config/cris/t-cris gt-cris.h cargo

cris: Remove config/cris/t-cris gt-cris.h cargo

Getting tired of:

make[1]: Entering directory 'x/gccobj/gcc'
Makefile:2682: warning: overriding recipe for target 'gt-cris.h'
xx/gcc/gcc/config/cris/t-cris:29: warning: ignoring old recipe for target 'gt-cris.h'

I'm just going to assume it is just stale cruft no longer (if
ever) needed since nothing else but sh/t-sh has it, and the
commit log shows just (x prepended to avoid commit-log parsing
confusion):
x    Merge from pch-branch up to tag pch-commit-20020603.
x
x    From-SVN: r54232

Building "works better"; the related warning is gone.

This effectively empties the t-cris file, but stuff will be
added soon enough that it's kept around.

gcc:
	* config/cris/t-cris: Remove gt-cris.h-related excessive cargo.