[xml] Creating Win32 wrapper function for exported variables

In Win32 you can import only functions from a library (.DLL) and not
variables.  This causes problems if libxml2 is built as a dll, and a program
attempts to use an exported variable.  It will compile/link, but will fail
at runtime.

I propose creating simple wrappers for global parsing variables.  A good
example program is xsltproc, which has a line

if (novalid == 0)
  xmlLoadExtDtdDefaultValue = 6;
  xmlLoadExtDtdDefaultValue = 0;

If xsltproc is linked against libxml2 as a .DLL (not as a .lib), this will
cause a segv.

I created a wrapper function in parserInternals so the code now looks like

if (novalid == 0)

Extremely simple, but saves us win32 programmers some troubles. (I also have
a xmlGetLoadExtDtdDefaultValue wrapper).

What do you think?  

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