fix: Guard ocr_text access with ENABLE_OCR preprocessor check

The ocr_text field in struct cc_bitmap is only defined when ENABLE_OCR
is set. Wrap the free() calls with #ifdef ENABLE_OCR to fix build
failures in non-OCR configurations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: cfsmp3

src/lib_ccx/matroska.c

@@ -1515,8 +1515,10 @@ static void process_vobsub_track_ocr(struct matroska_ctx *mkv_ctx, struct matros
 						free(rect[j].data0);
 					if (rect[j].data1)
 						free(rect[j].data1);
+#ifdef ENABLE_OCR
 					if (rect[j].ocr_text)
 						free(rect[j].ocr_text);
+#endif
 				}
 				free(sub.data);
 			}

src/lib_ccx/mp4.c

@@ -524,8 +524,10 @@ static int process_vobsub_track(struct lib_ccx_ctx *ctx, GF_ISOFile *f, u32 trac
 							free(rect[j].data0);
 						if (rect[j].data1)
 							free(rect[j].data1);
+#ifdef ENABLE_OCR
 						if (rect[j].ocr_text)
 							free(rect[j].ocr_text);
+#endif
 					}
 					free(vob_sub.data);
 				}