Fix MSVC build.

MSVC really needs these methods to be out of line, to avoid generating code for the shared pointers
in each translation unit which includes the header.

simgear/package/CMakeLists.txt

@@ -14,6 +14,7 @@ set(SOURCES
     Package.cxx
     Install.cxx
     Root.cxx
+	Delegate.cxx
 # internal helpers
     md5.h md5.c
     ioapi.c ioapi_mem.c ioapi.h

simgear/package/Delegate.cxx

@@ -0,0 +1,39 @@
+// Copyright (C) 2017  James Turner - zakalawe@mac.com
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#include <simgear/package/Delegate.hxx>
+#include <simgear/package/Install.hxx>
+#include <simgear/package/Package.hxx>
+#include <simgear/package/Catalog.hxx>
+
+namespace simgear
+{
+
+	namespace pkg
+	{
+
+		void Delegate::installStatusChanged(InstallRef aInstall, StatusCode aReason)
+		{
+		}
+
+		void Delegate::dataForThumbnail(const std::string& aThumbnailUrl,
+			size_t lenth, const uint8_t* bytes)
+		{
+		}
+
+	} // of namespace pkg
+} // of namespace simgear

simgear/package/Delegate.hxx

@@ -18,6 +18,7 @@
 #ifndef SG_PACKAGE_DELEGATE_HXX
 #define SG_PACKAGE_DELEGATE_HXX
 
+#include <string>
 #include <simgear/misc/stdint.hxx>
 #include <simgear/structure/SGSharedPtr.hxx>
 
@@ -81,10 +82,10 @@ public:
      * More general purpose notification when install is queued / cancelled / started
      * stopped. Reason value is only in certain cases.
      */
-    virtual void installStatusChanged(InstallRef aInstall, StatusCode aReason) {};
+    virtual void installStatusChanged(InstallRef aInstall, StatusCode aReason);
 
-    virtual void dataForThumbnail(const std::string& aThumbnailUrl,
-                                  size_t lenth, const uint8_t* bytes) {}
+	virtual void dataForThumbnail(const std::string& aThumbnailUrl,
+		size_t lenth, const uint8_t* bytes);
 };
 
 } // of namespace pkg