disas/sh4: Fix warning caused by missing 'static' attribute

Warning from the Sparse static analysis tool:

disas/sh4.c:335:22: warning:
 symbol 'sh_table' was not declared. Should it be static?
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

disas/sh4.c

@@ -332,7 +332,7 @@ typedef struct
 
 #ifdef DEFINE_TABLE
 
-const sh_opcode_info sh_table[] =
+static const sh_opcode_info sh_table[] =
   {
 /* 0111nnnni8*1.... add #<imm>,<REG_N>  */{"add",{A_IMM,A_REG_N},{HEX_7,REG_N,IMM0_8}, arch_sh1_up},