Update the spec reference testsuite submodule (#3450)

* Update the spec reference testsuite submodule

This commit brings in recent updates to the spec test suite. Most of the
changes here were already fixed in `wasmparser` with some tweaks to
esoteric modules, but Wasmtime also gets a bug fix where where import
matching for the size of tables/memories is based on the current runtime
size of the table/memory rather than the original type of the
table/memory. This means that during type matching the actual value is
consulted for its size rather than using the minimum size listed in its
type.

* Fix now-missing directories in build script

tests/misc_testsuite/linking-errors.wast

@@ -3,6 +3,7 @@
   (global (export "g mut i32") (mut i32)  (i32.const 0))
 
   (table (export "t funcref") 0 funcref)
+  (table (export "t externref") 0 externref)
   (memory (export "mem") 0)
 
   (func (export "f"))
@@ -32,6 +33,10 @@
   (module (import "m" "t funcref" (table 1 funcref)))
   "expected table limits (min: 1, max: none) doesn't match provided table limits (min: 0, max: none)")
 
+(assert_unlinkable
+  (module (import "m" "t externref" (table 0 funcref)))
+  "expected table of type `funcref`, found table of type `externref`")
+
 ;; errors on memories
 (assert_unlinkable
   (module (import "m" "mem" (memory 1)))

tests/misc_testsuite/reference-types/linking-errors.wast

@@ -1,8 +0,0 @@
-(module $m
-  (table (export "t externref") 0 externref)
-)
-
-(assert_unlinkable
-  (module (import "m" "t externref" (table 0 funcref)))
-  "expected table of type `funcref`, found table of type `externref`")
-