build: Add vobsub_decoder to autoconf build system

Add vobsub_decoder.c and vobsub_decoder.h to linux and mac Makefile.am
to fix autoconf build failures.

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

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

Author: cfsmp3

linux/Makefile.am

@@ -151,6 +151,8 @@ ccextractor_SOURCES = \
 				../src/lib_ccx/list.h \
 				../src/lib_ccx/matroska.c \
 				../src/lib_ccx/matroska.h \
+				../src/lib_ccx/vobsub_decoder.c \
+				../src/lib_ccx/vobsub_decoder.h \
 				../src/lib_ccx/mp4.c \
 				../src/lib_ccx/myth.c \
 				../src/lib_ccx/networking.c \

mac/Makefile.am

@@ -123,6 +123,8 @@ ccextractor_SOURCES = \
 				../src/lib_ccx/list.h \
 				../src/lib_ccx/matroska.c \
 				../src/lib_ccx/matroska.h \
+				../src/lib_ccx/vobsub_decoder.c \
+				../src/lib_ccx/vobsub_decoder.h \
 				../src/lib_ccx/mp4.c \
 				../src/lib_ccx/myth.c \
 				../src/lib_ccx/networking.c \