[sfml] Updated Linux build to SFML 2.4.1

spine-sfml/CMakeLists.txt

@@ -19,8 +19,8 @@ if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 		)
 	endif()
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
-    set(SFML_URL "http://www.sfml-dev.org/files/SFML-2.3.2-linux-gcc-64-bit.tar.gz")
-    set(SFML_DIR ${DEPS_DIR}/SFML-2.3.2)
+    set(SFML_URL "http://www.sfml-dev.org/files/SFML-2.4.1-linux-gcc-64-bit.tar.gz")
+    set(SFML_DIR ${DEPS_DIR}/SFML-2.4.1)
 	if (NOT EXISTS ${SFML_DIR})
 		message("Downloading SFML for Linux 64-bit")
 		file(DOWNLOAD "${SFML_URL}" "${DEPS_DIR}/sfml.tar.gz")