[bug-gnulib] memrchr use in chdir-long

[ericblake]

When compiling coreutils on cygwin, I get the warning:

chdir-long.c: In function `chdir_long':
chdir-long.c:176: warning: initialization makes pointer from integer without a 
cast

It looks like the memrchr module needs to provide a header, and the chdir-long 
module needs to depend on memrchr and include that header to get a prototype 
for memrchr().

--
Eric Blake