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.

gcc/config/cris/t-cris

@@ -24,6 +24,3 @@
 # The makefile macros etc. are included in the order found in the
 # section "Target Fragment" in the gcc info-files (or the paper copy) of
 # "Using and Porting GCC"
-
-$(out_object_file): gt-cris.h
-gt-cris.h : s-gtype ; @true