* lisp/mail/hashcash.el: Get rid of backquoted lambdas

Copyright-paperwork-exempt: yes

(hashcash-generate-payment-async): η-reduce.
(hashcash-insert-payment-async): Use proper closure.
1 job for master in 49 minutes and 23 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #1040
test-all

00:49:23

 
Name Stage Failure
failed
test-all Test
Makefile:313: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
make[2]: *** [check-doit] Error 1
Makefile:288: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:962: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1