Disable multi-threading in libjte of GNU xorriso if pthread_cancel() is missing

xorriso/configure_ac.txt

@@ -338,6 +338,17 @@ AC_ARG_ENABLE(jtethreads,
                , enable_jtethreads=yes) 
 if test x$LIBJTE_DEF = xyes
 then
+    if test "x$enable_jtethreads" = xyes; then
+        mem_LDFLAGs="$LDFLAGS"
+        LDFLAGS="$LDFLAGS $THREAD_LIBS"
+        AC_MSG_CHECKING([for pthread_cancel()]) 
+        AC_TRY_LINK([#include <pthread.h>],
+                    [pthread_cancel((pthread_t) NULL);],
+                    [],
+                    [enable_jtethreads=no])
+        AC_MSG_RESULT([$enable_jtethreads])
+        LDFLAGS="$mem_LDFLAGS"
+    fi
     if test "x$enable_jtethreads" = xyes; then
         AC_DEFINE([THREADED_CHECKSUMS], [])
         echo "enabled  multi-threading in libjte"