execute1: sub_mux_sel and result_mux_sel are unused

Remove them.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

execute1.vhdl

@@ -113,8 +113,6 @@ architecture behaviour of execute1 is
     signal misc_result: std_ulogic_vector(63 downto 0);
     signal muldiv_result: std_ulogic_vector(63 downto 0);
     signal spr_result: std_ulogic_vector(63 downto 0);
-    signal result_mux_sel: std_ulogic_vector(2 downto 0);
-    signal sub_mux_sel: std_ulogic_vector(2 downto 0);
     signal next_nia : std_ulogic_vector(63 downto 0);
     signal current: Decode2ToExecute1Type;