Add slotcache to dist/configure

Author: svaarala

tools/configure.py

@@ -456,6 +456,7 @@ def default_from_script_path(optname, orig, alternatives):
         'duk_heap_refcount.c',
         'duk_heap_stringcache.c',
         'duk_heap_stringtable.c',
+        'duk_heap_slotcache.c',
         'duk_hnatfunc.h',
         'duk_hobject_alloc.c',
         'duk_hobject_class.c',

util/dist.py

@@ -372,6 +372,7 @@ def main():
         'duk_heap_refcount.c',
         'duk_heap_stringcache.c',
         'duk_heap_stringtable.c',
+        'duk_heap_slotcache.c',
         'duk_hnatfunc.h',
         'duk_hobject_alloc.c',
         'duk_hobject_class.c',