target-cris: Drop unused cpu_cris_close() prototype

Such a function never existed.
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@gmail.com>

target-cris/cpu.h

@@ -175,7 +175,6 @@ typedef struct CPUCRISState {
 
 CRISCPU *cpu_cris_init(const char *cpu_model);
 int cpu_cris_exec(CPUCRISState *s);
-void cpu_cris_close(CPUCRISState *s);
 void do_interrupt(CPUCRISState *env);
 /* you can call this signal handler from your SIGBUS and SIGSEGV
    signal handlers to inform the virtual CPU of exceptions. non zero