[ccan] make check fails in coroutine module

[Ian Zimmerman]

cc -g3 -ggdb -Wall -Wstrict-prototypes -Wold-style-definition -Wundef -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wwrite-strings -DCCAN_STR_DEBUG=1 -I.  -MMD -MP -MFccan/coroutine/coroutine.o.d -MTccan/coroutine/coroutine.o -c ccan/coroutine/coroutine.c -o ccan/coroutine/coroutine.o
tools/ccanlint/ccanlint -s --deps-fail-ignore   ccan/coroutine/ && touch ccan/coroutine/.ok
coroutine: Module's run and api tests pass (tests_pass): FAIL (+0/3)
/home/itz/git/ccan/ccan/coroutine/test/api-2.c:1..10
ok 1 - coroutine_stack_check(stack1, NULL) == stack1
ok 2 - coroutine_stack_size(stack1) == bufsz - COROUTINE_STK_OVERHEAD
ok 3 - coroutine_stack_check(stack2, NULL) == stack2
ok 4 - coroutine_stack_size(stack2) == bufsz - COROUTINE_STK_OVERHEAD
sh: line 1: 24908 Segmentation fault      (core dumped) valgrind -q --leak-check=full --log-fd=3 /tmp/ccanlint-24709.1804289383/api-2 3> /tmp/ccanlint-24709.1804289383/api-2.valgrind-log

... more (use -vv to see them all)
coroutine: Total score: 35/43 FAIL!
make: *** [Makefile:78: ccan/coroutine/.ok] Error 1

Perhaps it is relevant that the configurator check causing the segfault
- as discussed in the other thread - is HAVE_POINTER_SAFE_MAKECONTEXT
which, I believe, is only used by coroutine module.

Platform: x86_64, Fedora 28, gcc 8.3.1, glibc 2.27.  I didn't set any
special build flags or anything.

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