Add setup-enabled marking to two extension modules.

Author: kpfleming

cpython-unix/extension-modules.yml

@@ -545,6 +545,7 @@ _struct:
     - _struct.c
 
 _suggestions:
+  setup-enabled: true
   minimum-python-version: '3.13'
   sources:
     - _suggestions.c
@@ -553,6 +554,7 @@ _symtable:
   setup-enabled: true
 
 _sysconfig:
+  setup-enabled: true
   minimum-python-version: '3.13'
   sources:
     - _sysconfig.c