Revert "Update lua plugin to 5.2.3"

FILE typedef to *void needs more work to not break sim and
application builds. I checked only a few random native builds
unfortunately. Sorry for inconvenience.

apps/plugins/lua/SOURCES

@@ -31,13 +31,12 @@ rocklib.c
 tlsf_helper.c
 fscanf.c
 gmtime.c
-strspn.c
+strcspn.c
 strftime.c
 strncat.c
 strpbrk.c
 strtoul.c
 strtol.c
 strstr.c
-getc.c
 rocklua.c
 luadir.c