Add all the Visual Studio files in the tarball

This is gonna make a big tarball!

Fixes #569

Makefile.am

@@ -10,6 +10,7 @@ EXTRA_DIST = \
 	THANKS
 
 SUBDIRS = \
+	builds \
 	contrib \
 	dist-build \
 	msvc-scripts \

builds/Makefile.am

@@ -0,0 +1,65 @@
+EXTRA_DIST = \
+	msvc/build/buildall.bat \
+	msvc/build/buildbase.bat \
+	msvc/properties/Common.props \
+	msvc/properties/Debug.props \
+	msvc/properties/DebugDEXE.props \
+	msvc/properties/DebugDLL.props \
+	msvc/properties/DebugLEXE.props \
+	msvc/properties/DebugLIB.props \
+	msvc/properties/DebugLTCG.props \
+	msvc/properties/DebugSEXE.props \
+	msvc/properties/DLL.props \
+	msvc/properties/EXE.props \
+	msvc/properties/LIB.props \
+	msvc/properties/Link.props \
+	msvc/properties/LTCG.props \
+	msvc/properties/Messages.props \
+	msvc/properties/Output.props \
+	msvc/properties/Release.props \
+	msvc/properties/ReleaseDEXE.props \
+	msvc/properties/ReleaseDLL.props \
+	msvc/properties/ReleaseLEXE.props \
+	msvc/properties/ReleaseLIB.props \
+	msvc/properties/ReleaseLTCG.props \
+	msvc/properties/ReleaseSEXE.props \
+	msvc/properties/Win32.props \
+	msvc/properties/x64.props \
+	msvc/resource.h \
+	msvc/resource.rc \
+	msvc/version.h \
+	msvc/vs2010/libsodium/libsodium.props \
+	msvc/vs2010/libsodium/libsodium.vcxproj \
+	msvc/vs2010/libsodium/libsodium.vcxproj.filters \
+	msvc/vs2010/libsodium/libsodium.xml \
+	msvc/vs2010/libsodium.import.props \
+	msvc/vs2010/libsodium.import.xml \
+	msvc/vs2010/libsodium.sln \
+	msvc/vs2012/libsodium/libsodium.props \
+	msvc/vs2012/libsodium/libsodium.vcxproj \
+	msvc/vs2012/libsodium/libsodium.vcxproj.filters \
+	msvc/vs2012/libsodium/libsodium.xml \
+	msvc/vs2012/libsodium.import.props \
+	msvc/vs2012/libsodium.import.xml \
+	msvc/vs2012/libsodium.sln \
+	msvc/vs2013/libsodium/libsodium.props \
+	msvc/vs2013/libsodium/libsodium.vcxproj \
+	msvc/vs2013/libsodium/libsodium.vcxproj.filters \
+	msvc/vs2013/libsodium/libsodium.xml \
+	msvc/vs2013/libsodium.import.props \
+	msvc/vs2013/libsodium.import.xml \
+	msvc/vs2013/libsodium.sln \
+	msvc/vs2015/libsodium/libsodium.props \
+	msvc/vs2015/libsodium/libsodium.vcxproj \
+	msvc/vs2015/libsodium/libsodium.vcxproj.filters \
+	msvc/vs2015/libsodium/libsodium.xml \
+	msvc/vs2015/libsodium.import.props \
+	msvc/vs2015/libsodium.import.xml \
+	msvc/vs2015/libsodium.sln \
+	msvc/vs2017/libsodium/libsodium.props \
+	msvc/vs2017/libsodium/libsodium.vcxproj \
+	msvc/vs2017/libsodium/libsodium.vcxproj.filters \
+	msvc/vs2017/libsodium/libsodium.xml \
+	msvc/vs2017/libsodium.import.props \
+	msvc/vs2017/libsodium.import.xml \
+	msvc/vs2017/libsodium.sln

configure.ac

@@ -718,6 +718,7 @@ AH_VERBATIM([NDEBUG], [/* Always evaluate assert() calls */
 #endif])
 
 AC_CONFIG_FILES([Makefile
+                 builds/Makefile
                  contrib/Makefile
                  dist-build/Makefile
                  libsodium.pc