tci: Remove function tcg_out64 (fix broken build)

Commit ac26eb69 added tcg_out64 to tcg/tcg.c.
tcg/tci/tcg-target.c already had a nearly identical implementation which is
now removed to fix a compiler error.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

tcg/tci/tcg-target.c

@@ -415,13 +415,6 @@ static void tcg_out_i(TCGContext *s, tcg_target_ulong v)
     s->code_ptr += sizeof(tcg_target_ulong);
 }
 
-/* Write 64 bit value. */
-static void tcg_out64(TCGContext *s, uint64_t v)
-{
-    *(uint64_t *)s->code_ptr = v;
-    s->code_ptr += sizeof(v);
-}
-
 /* Write opcode. */
 static void tcg_out_op_t(TCGContext *s, TCGOpcode op)
 {