Fix compilation issue

Issue arose when C_ARITH_CODING_SUPPORTED was undefined

jccoefct.c

@@ -367,14 +367,19 @@ compress_trellis_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
     c_derived_tbl actbl_data;
     c_derived_tbl *actbl = &actbl_data;
     
+#ifdef C_ARITH_CODING_SUPPORTED
     arith_rates arith_r_data;
     arith_rates *arith_r = &arith_r_data;
+#endif
     
     compptr = cinfo->cur_comp_info[ci];
 
+#ifdef C_ARITH_CODING_SUPPORTED
     if (cinfo->arith_code)
       jget_arith_rates(cinfo, compptr->dc_tbl_no, compptr->ac_tbl_no, arith_r);
-    else {
+    else
+#endif
+    {
       jpeg_make_c_derived_tbl(cinfo, TRUE, compptr->dc_tbl_no, &dctbl);
       jpeg_make_c_derived_tbl(cinfo, FALSE, compptr->ac_tbl_no, &actbl);
     }
@@ -413,6 +418,7 @@ compress_trellis_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
     for (block_row = 0; block_row < block_rows; block_row++) {
       thisblockrow = buffer[block_row];
       lastblockrow = (block_row > 0) ? buffer[block_row-1] : NULL;
+#ifdef C_ARITH_CODING_SUPPORTED
       if (cinfo->arith_code)
         quantize_trellis_arith(cinfo, arith_r, thisblockrow,
                                buffer_dst[block_row], blocks_across,
@@ -421,6 +427,7 @@ compress_trellis_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
                                cinfo->master->norm_coef[compptr->quant_tbl_no],
                                &lastDC, lastblockrow, buffer_dst[block_row-1]);
       else
+#endif
         quantize_trellis(cinfo, dctbl, actbl, thisblockrow,
                          buffer_dst[block_row], blocks_across,
                          cinfo->quant_tbl_ptrs[compptr->quant_tbl_no],

jcdctmgr.c

@@ -1261,6 +1261,7 @@ quantize_trellis(j_compress_ptr cinfo, c_derived_tbl *dctbl, c_derived_tbl *actb
 
 }
 
+#ifdef C_ARITH_CODING_SUPPORTED
 GLOBAL(void)
 quantize_trellis_arith(j_compress_ptr cinfo, arith_rates *r, JBLOCKROW coef_blocks, JBLOCKROW src, JDIMENSION num_blocks,
                  JQUANT_TBL * qtbl, double *norm_src, double *norm_coef, JCOEF *last_dc_val,
@@ -1604,6 +1605,7 @@ quantize_trellis_arith(j_compress_ptr cinfo, arith_rates *r, JBLOCKROW coef_bloc
     }
   }
 }
+#endif
 
 /*
  * Initialize FDCT manager.

jpegint.h

@@ -91,6 +91,7 @@ struct jpeg_comp_master {
   float trellis_delta_dc_weight;
 };
 
+#ifdef C_ARITH_CODING_SUPPORTED
 /* The following two definitions specify the allocation chunk size
  * for the statistics area.
  * According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
@@ -114,6 +115,7 @@ typedef struct {
   int arith_dc_U;
   int arith_ac_K;
 } arith_rates;
+#endif
 
 /* Main buffer control (downsampled-data buffer) */
 struct jpeg_c_main_controller {
@@ -389,12 +391,14 @@ EXTERN(void) jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row,
                               JDIMENSION num_blocks);
 EXTERN(void) jzero_far (void * target, size_t bytestozero);
 
+#ifdef C_ARITH_CODING_SUPPORTED
 EXTERN(void) jget_arith_rates (j_compress_ptr cinfo, int dc_tbl_no, int ac_tbl_no, arith_rates *r);
 
 EXTERN(void) quantize_trellis_arith
 (j_compress_ptr cinfo, arith_rates *r, JBLOCKROW coef_blocks, JBLOCKROW src, JDIMENSION num_blocks,
  JQUANT_TBL * qtbl, double *norm_src, double *norm_coef, JCOEF *last_dc_val,
  JBLOCKROW coef_blocks_above, JBLOCKROW src_above);
+#endif
 
 /* Constant tables in jutils.c */
 #if 0                           /* This table is not actually needed in v6a */