lib: tutf8e: Updated API to support conversion of invalid input characters (#2326)

Signed-off-by: Nigel Stewart <[email protected]>

Author: nigels-com

lib/tutf8e/CMakeLists.txt

@@ -14,4 +14,4 @@ set_property(TARGET tutf8e PROPERTY C_EXTENSIONS OFF)
 add_executable(tutf8e-test test/test.c)
 target_link_libraries(tutf8e-test tutf8e)
 set_property(TARGET tutf8e-test PROPERTY C_STANDARD 99)
-set_property(TARGET tutf8e-test PROPERTY C_EXTENSIONS OFF)
+set_property(TARGET tutf8e-test PROPERTY C_EXTENSIONS ON)