Fixes windows / MSVC side of r4521 for #604 (export TXML symbols with DLL interface)

git-svn-id: https://svn.code.sf.net/p/speed-dreams/code/trunk@4526 30fe4595-0a0c-4342-8851-515496e4dcbd

Former-commit-id: 5b3c4fa23dff76e0d23439c440293dcc1904d0fd
Former-commit-id: bfc1d689c202a41a8e907dd7a8b8c3c681bb3f9f

src/libs/txml/copying.txt

@@ -32,6 +32,9 @@ xmlrole.h
 xmltok_impl.h
 --
 
+'xmlparse.h' was slightly modified in order its exported symbols have a DLL interface
+under Windows / MSVC (limited to the XMLPARSEAPI define).
+
 'nametab.h' was sourced from:
 http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/nametab.h?view=log&hideattic=0&pathrev=MAIN
 

src/libs/txml/xmlparse.h

@@ -10,8 +10,15 @@ See the file copying.txt for copying permission.
 extern "C" {
 #endif
 
-#ifndef XMLPARSEAPI
-#define XMLPARSEAPI /* as nothing */
+// DLL exported symbols declarator for Windows.
+#ifdef WIN32
+# ifdef TXML_DLL
+#  define XMLPARSEAPI __declspec(dllexport)
+# else
+#  define XMLPARSEAPI __declspec(dllimport)
+# endif
+#else
+# define XMLPARSEAPI
 #endif
 
 typedef void *XML_Parser;