Fix "wuffs genlib" for wuffs_base__foo__func_ptrs
diff --git a/internal/cgen/cgen.go b/internal/cgen/cgen.go
index ca1b17b..b83454e 100644
--- a/internal/cgen/cgen.go
+++ b/internal/cgen/cgen.go
@@ -341,6 +341,15 @@
 
 		buf.printf("extern const char* wuffs_base__%s__vtable_name;\n\n", n)
 
+		buf.writes("typedef struct {\n\n")
+		for _, f := range builtInInterfaceMethods[qid] {
+			if err := g.writeFuncSignature(buf, f, wfsCFuncPtrField); err != nil {
+				return err
+			}
+			buf.writes(";\n")
+		}
+		buf.printf("} wuffs_base__%s__func_ptrs;\n\n", n)
+
 		buf.printf("typedef struct wuffs_base__%s__struct wuffs_base__%s;\n\n", n, n)
 
 		for _, f := range builtInInterfaceMethods[qid] {
@@ -401,15 +410,6 @@
 		buf.printf("const char* wuffs_base__%s__vtable_name = "+
 			"\"{vtable}wuffs_base__%s\";\n\n", n, n)
 
-		buf.writes("typedef struct {\n\n")
-		for _, f := range builtInInterfaceMethods[qid] {
-			if err := g.writeFuncSignature(buf, f, wfsCFuncPtrField); err != nil {
-				return err
-			}
-			buf.writes(";\n")
-		}
-		buf.printf("} wuffs_base__%s__func_ptrs;\n\n", n)
-
 		for _, f := range builtInInterfaceMethods[qid] {
 			returnsStatus := f.Effect().Coroutine() ||
 				((f.Out() != nil) && f.Out().IsStatus())
diff --git a/release/c/wuffs-unsupported-snapshot.c b/release/c/wuffs-unsupported-snapshot.c
index ddaa006..93cbc3c 100644
--- a/release/c/wuffs-unsupported-snapshot.c
+++ b/release/c/wuffs-unsupported-snapshot.c
@@ -2568,6 +2568,10 @@
 
 extern const char* wuffs_base__hasher_u32__vtable_name;
 
+typedef struct {
+  uint32_t (*update_u32)(void* self, wuffs_base__slice_u8 a_x);
+} wuffs_base__hasher_u32__func_ptrs;
+
 typedef struct wuffs_base__hasher_u32__struct wuffs_base__hasher_u32;
 
 WUFFS_BASE__MAYBE_STATIC uint32_t  //
@@ -4635,10 +4639,6 @@
 const char* wuffs_base__hasher_u32__vtable_name =
     "{vtable}wuffs_base__hasher_u32";
 
-typedef struct {
-  uint32_t (*update_u32)(void* self, wuffs_base__slice_u8 a_x);
-} wuffs_base__hasher_u32__func_ptrs;
-
 WUFFS_BASE__MAYBE_STATIC uint32_t  //
 wuffs_base__hasher_u32__update_u32(wuffs_base__hasher_u32* self,
                                    wuffs_base__slice_u8 a_x) {