add reference to required .lib files to fix linker errors reported by stu

This was SVN commit r1860.

source/lib/sysdep/win/wdbg.cpp

@@ -33,6 +33,7 @@
 
 #ifdef _MSC_VER
 #pragma comment(lib, "dbghelp.lib")
+#pragma comment(lib, "oleaut32.lib")	// VariantChangeType
 #endif
 
 

source/lib/sysdep/win/win.cpp

@@ -28,6 +28,10 @@
 #include <malloc.h>
 #include <shlobj.h>	// pick_dir
 
+#ifdef _MSC_VER
+#pragma comment(lib, "shell32.lib")	// for pick_directory SH* calls
+#endif
+
 
 void sle(int x)
 {
@@ -56,6 +60,7 @@ inline int get_executable_name(char* n_path, size_t buf_size)
 	return nbytes? 0 : -1;
 }
 
+
 static int CALLBACK browse_cb(HWND hWnd, unsigned int msg, LPARAM lParam, LPARAM ldata)
 {
 	UNUSED(lParam);