Fix Windows build...

... unfortunately inclusion of ErrorDialog.h in FileNames.h ties nine files
into a low-level s.c.c.

src/FileNames.cpp

@@ -36,6 +36,7 @@ used throughout Audacity into this one place.
 #include "Internat.h"
 #include "PlatformCompatibility.h"
 #include "wxFileNameWrapper.h"
+#include "widgets/ErrorDialog.h"
 #include "../lib-src/FileDialog/FileDialog.h"
 
 #if defined(__WXMAC__) || defined(__WXGTK__)
@@ -583,6 +584,8 @@ void FileNames::FindFilesInPathList(const wxString & pattern,
 }
 
 #if defined(__WXMSW__)
+wxCharBuffer FileNames::mFilename;
+
 //
 // On Windows, wxString::mb_str() can return a NULL pointer if the
 // conversion to multi-byte fails.  So, based on direction intent,

src/FileNames.h

@@ -149,6 +149,9 @@ public:
     * on Windows */
 #if defined(__WXMSW__)
    static char *VerifyFilename(const wxString &s, bool input = true);
+   
+   // stuff for file name sanitisation
+   static wxCharBuffer mFilename;
 #endif
 
 private:

src/Internat.cpp

@@ -40,7 +40,6 @@ and on Mac OS X for the filesystem.
 
 wxChar Internat::mDecimalSeparator = wxT('.'); // default
 wxArrayString Internat::exclude;
-wxCharBuffer Internat::mFilename;
 
 // DA: Use tweaked translation mechanism to replace 'Audacity' by 'DarkAudacity'.
 #ifdef EXPERIMENTAL_DA

src/Internat.h

@@ -142,10 +142,7 @@ public:
 private:
    static wxChar mDecimalSeparator;
 
-   // stuff for file name sanitisation
    static wxArrayString exclude;
-
-   static wxCharBuffer mFilename;
 };
 
 #define _NoAcc(X) Internat::StripAccelerators(_(X))

src/commands/CommandBuilder.cpp

@@ -29,7 +29,7 @@ system by constructing BatchCommandEval objects.
 #include "ScriptCommandRelay.h"
 #include "CommandContext.h"
 #include "CommandTargets.h"
-#include "Shuttle.h"
+#include "../Shuttle.h"
 
 CommandBuilder::CommandBuilder(const wxString &cmdString)
    : mValid(false)

src/prefs/GUIPrefs.cpp

@@ -287,6 +287,7 @@ wxString GUIPrefs::InitLang( wxString langCode )
    return SetLang(langCode);
 }
 
+#define IPC_APPL wxT("audacity")
 static std::unique_ptr<wxLocale> sLocale;
 
 wxString GUIPrefs::SetLang( const wxString & lang )