simdutf: update to 8.0.0

.github/workflows/simdutf-is-genuine.yml

@@ -0,0 +1,18 @@
+name: simdutf-is-genuine
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  simdutf-is-genuine:
+    runs-on: ubuntu-slim
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check if vendored simdutf is genuine
+        run: |
+          cd simdutf
+          curl -L https://github.com/simdutf/simdutf/releases/download/v8.0.0/singleheader.zip -O
+          unzip -o singleheader.zip
+          git diff --exit-code

simdutf/hs_simdutf.c

@@ -0,0 +1,9 @@
+#include "simdutf_c.h"
+
+int _hs_text_is_valid_utf8(const char *buf, size_t len) {
+  return simdutf_validate_utf8(buf, len);
+}
+
+int _hs_text_is_valid_utf8_offset(const char *buf, size_t off, size_t len) {
+  return simdutf_validate_utf8(buf + off, len);
+}