tests: Replace deprecated fail(_unless) calls

tests: Replace deprecated fail(_unless) calls

A new API (ck_assert) to replace fail_* was introduced in check
0.9.6 (released in 2008), and fail_* has been deprecated since at least
0.9.10 (released in 2013).

This patch was automated with coccinelle:

  spatch --sp-file patch.coc --in-place tests/*.c

@@
expression msg;
@@
 <...
- fail(msg);
+ ck_abort_msg(msg);
  ...>

@@
expression msg, arg1;
@@
 <...
- fail(msg, arg1);
+ ck_abort_msg(msg, arg1);
  ...>

@@
expression msg, arg1, arg2;
@@
 <...
- fail(msg, arg1, arg2);
+ ck_abort_msg(msg, arg1, arg2);
  ...>

@@
expression expr;
@@

  <...
- fail_unless(expr);
+ ck_assert(expr);
  ...>

@@
expression expr, msg;
@@

  <...
- fail_unless(expr, msg);
+ ck_assert_msg(expr, msg);
  ...>

@@
expression expr, msg, arg1;
@@

  <...
- fail_unless(expr, msg, arg1);
+ ck_assert_msg(expr, msg, arg1);
  ...>

@@
expression expr, msg, arg1, arg2;
@@

  <...
- fail_unless(expr, msg, arg1, arg2);
+ ck_assert_msg(expr, msg, arg1, arg2);
  ...>

@@
expression expr, msg, arg1, arg2, arg3;
@@

  <...
- fail_unless(expr, msg, arg1, arg2, arg3);
+ ck_assert_msg(expr, msg, arg1, arg2, arg3);
  ...>

@@
expression expr, msg, arg1, arg2, arg3, arg4;
@@

  <...
- fail_unless(expr, msg, arg1, arg2, arg3, arg4);
+ ck_assert_msg(expr, msg, arg1, arg2, arg3, arg4);
  ...>

@@
expression expr, msg, arg1, arg2, arg3, arg4, arg5;
@@

  <...
- fail_unless(expr, msg, arg1, arg2, arg3, arg4, arg5);
+ ck_assert_msg(expr, msg, arg1, arg2, arg3, arg4, arg5);
  ...>