Ading patch to build SDL2pp statically

ext/CMakeLists.txt

@@ -388,7 +388,7 @@ ExternalProject_Add(SDL2pp_build
 	URL ${SDL2pp_SRC}
 	# patch #1: SDL2pp currently builds only shared library in standalone mode but we want static
 	# patch #2: fix include paths when SDL_image is installed into a directory other than where SDL itself is installed
-	# PATCH_COMMAND patch -p1 < "${CMAKE_CURRENT_SOURCE_DIR}/patches/sdl2pp.patch"
+	PATCH_COMMAND patch -p1 < "${CMAKE_CURRENT_SOURCE_DIR}/patches/sdl2pp-make-lib-static.patch"
 	# due to the way cmake handles ';' in strings (lists), use ':' and let ExternalProject
 	# replace these by ';'
 	LIST_SEPARATOR ":"

ext/patches/sdl2pp-make-lib-static.patch

 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index f539296..b554caa 100644
+index c831586..acb4143 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -209,7 +209,7 @@ INCLUDE(GenerateExportHeader)
+@@ -204,7 +204,7 @@ IF(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
+ 	OPTION(SDL2PP_WITH_EXAMPLES "Build examples" ON)
+ 	OPTION(SDL2PP_WITH_TESTS "Build tests" ON)
+ 	OPTION(SDL2PP_ENABLE_LIVE_TESTS "Enable live tests (require X11 display and audio device)" ON)
+-	OPTION(SDL2PP_STATIC "Build static library instead of shared one" OFF)
++	OPTION(SDL2PP_STATIC "Build static library instead of shared one" ON)
  
- IF(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
  	# library
--	ADD_LIBRARY(SDL2pp SHARED ${LIBRARY_SOURCES} ${LIBRARY_HEADERS})
-+	ADD_LIBRARY(SDL2pp STATIC ${LIBRARY_SOURCES} ${LIBRARY_HEADERS})
- 	GENERATE_EXPORT_HEADER(SDL2pp EXPORT_FILE_NAME SDL2pp/Export.hh)
- 	TARGET_LINK_LIBRARIES(SDL2pp ${SDL2_ALL_LIBRARIES})
- 	SET_TARGET_PROPERTIES(SDL2pp PROPERTIES VERSION 8.0.0 SOVERSION 8)
+ 	IF(SDL2PP_STATIC)