mkdir: depend on sys_stat

[Bruno Haible]

mkdir has two portability problems: one with the trailing slash, one with
the declaration on mingw. The former is solved by the 'mkdir' module, the
latter by the 'sys_stat' module. This is confusing. How can anyone remember
this? If someone wants a working mkdir() function, one module should be
enough, and it is the 'mkdir' module. I'm therefore applying this:

2007-05-01  Bruno Haible  <address@hidden>

        * modules/mkdir (Depends-on): Add sys_stat, because sys_stat provides
        the portability of 'mkdir' to mingw systems.

*** modules/mkdir       13 Oct 2006 12:40:23 -0000      1.7
--- modules/mkdir       1 May 2007 10:41:30 -0000
***************
*** 6,11 ****
--- 6,12 ----
  m4/mkdir-slash.m4
  
  Depends-on:
+ sys_stat
  xalloc
  dirname