Add suport for "make uninstall" to cmake.

CMakeLists.txt

@@ -1308,3 +1308,12 @@ else()
   install(TARGETS SDL2 RUNTIME DESTINATION bin)
 endif()
 
+##### Uninstall target #####
+
+configure_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake_uninstall.cmake.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
+    IMMEDIATE @ONLY)
+
+add_custom_target(uninstall
+    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)

cmake_uninstall.cmake.in

@@ -0,0 +1,18 @@
+if (NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
+    message(FATAL_ERROR "Cannot find install manifest: \"@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt\"")
+endif(NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
+
+file(READ "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt" files)
+string(REGEX REPLACE "\n" ";" files "${files}")
+foreach (file ${files})
+    message(STATUS "Uninstalling \"$ENV{DESTDIR}${file}\"")
+    execute_process(
+        COMMAND @CMAKE_COMMAND@ -E remove "$ENV{DESTDIR}${file}"
+        OUTPUT_VARIABLE rm_out
+        RESULT_VARIABLE rm_retval
+    )
+    if(NOT ${rm_retval} EQUAL 0)
+        message(FATAL_ERROR "Problem when removing \"$ENV{DESTDIR}${file}\"")
+    endif (NOT ${rm_retval} EQUAL 0)
+endforeach(file)
+