Link the updater with the static VC++ runtime on Windows

This allows the updater to work on older Windows XP systems
without the VC++ 2008 runtime redistributable installed.

 * Add statically linked pre-built versions of the zlib and
   bzip2 libraries.

This increases the size of the updater executable by 200KB
to ~400KB on Windows.

CMakeLists.txt

@@ -17,6 +17,11 @@ if (WIN32)
 include_directories(external/zlib/)
 include_directories(external/bzip2)
 include_directories(external/win32cpp/include)
+
+# Link the updater binary statically with the Visual C++ runtime
+# so that the executable can function standalone
+set(CMAKE_CXX_FLAGS_RELEASE "/MT /O2 /Ob2 /D NDEBUG")
+set(CMAKE_C_FLAGS_RELEASE "/MT /O2 /Ob2 /D NDEBUG")
 endif()
 
 if (APPLE)

external/minizip/CMakeLists.txt

@@ -36,8 +36,8 @@ if (UNIX)
 	target_link_libraries(minizip z bz2)
 else()
 	target_link_libraries(minizip
-		"${CMAKE_CURRENT_SOURCE_DIR}/../zlib/prebuilt/zlib.lib"
+		"${CMAKE_CURRENT_SOURCE_DIR}/../zlib/prebuilt/zlib_static.lib"
-		"${CMAKE_CURRENT_SOURCE_DIR}/../bzip2/libbz2.lib"
+		"${CMAKE_CURRENT_SOURCE_DIR}/../bzip2/libbz2_static.lib"
 	)
 endif()