Support ~USER for some names on MS-Windows

* src/w32.c (getpwnam): Support usernames provided through
LOGNAME or USERNAME environment variables, to mimic what
editfns.c:init_editfns does.
1 job for master in 51 minutes and 49 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #816
test-all

00:51:49

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:309: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:284: 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