[xslt] New security features and Windows

[Igor Zlatkovic <igor stud fh-frankfurt de>]

Hi there,

I have commited few things to make the newly introduced security features in
libxslt work:

1. Modified win32/Makefile.msvc to take the new file security.c into
consideration.
2. Modified win32/libxslt.def.src to export the new functions from
security.c.
3. Modified libxslt/win32config.h to remap mkdir to _mkdir.

About 3: MS runtime has '_mkdir' function and if __STDC__ does not evaluate
to something true, then it has 'mkdir' as well. Both functions take only one
parameter, namely the name of the new directory. The classic UGO creation
mode has no meaning on Windows filesystems, so someone at MS saw fit to omit
the second parameter. What I did is:

  #if defined(_MSC_VER)
  #define mkdir(p,m) (_mkdir(p))
  #endif

Since macros have precedence over functions, this will work in all cases.

Ciao
Igor