Config: Disable ES6 Reflect in lowmem build

Low-memory baseline is E5.1.

config/examples/low_memory.yaml

@@ -92,3 +92,4 @@ DUK_USE_ES6_PROXY: false  # roughly 2kB footprint
 DUK_USE_ES7_EXP_OPERATOR: false  # pulls in pow()
 DUK_USE_ENCODING_BUILTINS: false
 DUK_USE_ES6_UNICODE_ESCAPE: false
+DUK_USE_REFLECT_BUILTIN: false

config/examples/low_memory_strip.yaml

@@ -38,5 +38,7 @@ DUK_USE_FUNCTION_BUILTIN: false
 DUK_USE_OBJECT_BUILTIN: false
 DUK_USE_DUKTAPE_BUILTIN: false
 DUK_USE_JSON_BUILTIN: false
+DUK_USE_ENCODING_BUILTINS: false
+DUK_USE_REFLECT_BUILTIN: false
 DUK_USE_JSON_SUPPORT: false   # also disables JSON support for C API
 DUK_USE_GLOBAL_BUILTIN: false