Excluded unused libburn source module crc.c from GNU xorriso tarball

xorriso/xorriso_makefile_am.txt

@@ -122,7 +122,6 @@ xorriso_xorriso_SOURCES = \
 	libburn/back_hacks.h \
 	libburn/cleanup.c \
 	libburn/cleanup.h \
-	libburn/crc.c \
 	libburn/crc.h \
 	libburn/debug.c \
 	libburn/debug.h \
@@ -171,6 +170,9 @@ xorriso_xorriso_SOURCES = \
 	\
 	version.h
 
+# Disabled because unneeded and of unclear ancestry
+#	libburn/crc.c 
+
 noinst_PROGRAMS = \
 	test/compare_file