Fix Tess broken files

Implements immutable path creation constructor for SokolRenderPath.

Noticed that some files were no longer rendering with the tess renderer. We merged #4169 which now creates the artboard background via the immutable render path constructor. Tess wasn't implementing this so any file clipped against the artboard would end up drawing nothing into the clip stencil, so everything would get clipped.

Diffs=
4bc43ad92 Implements immutable path creation constructor for SokolRenderPath.

.rive_head

diff --git a/.rive_head b/.rive_head
index eba037c..3bc8648 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-d4d6067a3b7f5c0dd7bb33286f8c49cf7c15159c
+4bc43ad929a73747f0ed51401d0b9a2d69188bb9

tess/src/sokol/sokol_tess_renderer.cpp

diff --git a/tess/src/sokol/sokol_tess_renderer.cpp b/tess/src/sokol/sokol_tess_renderer.cpp
index acd0113..59a9c36 100644
--- a/tess/src/sokol/sokol_tess_renderer.cpp
+++ b/tess/src/sokol/sokol_tess_renderer.cpp
@@ -17,6 +17,8 @@
 class SokolRenderPath : public TessRenderPath {
 public:
     SokolRenderPath() {}
+    SokolRenderPath(Span<const Vec2D> points, Span<const PathVerb> verbs, FillRule fillRule) :
+        TessRenderPath(points, verbs, fillRule) {}
 
     ~SokolRenderPath() {
         sg_destroy_buffer(m_vertexBuffer);
@@ -79,7 +81,6 @@
                 .type = SG_BUFFERTYPE_VERTEXBUFFER,
                 .data =
                     {
-
                         m_vertices.data(),
                         m_vertices.size() * sizeof(Vec2D),
                     },
@@ -126,8 +127,8 @@
 // Returns a full-formed RenderPath -- can be treated as immutable
 std::unique_ptr<RenderPath> SokolFactory::makeRenderPath(Span<const Vec2D> points,
                                                          Span<const PathVerb> verbs,
-                                                         FillRule) {
-    return std::make_unique<SokolRenderPath>();
+                                                         FillRule rule) {
+    return std::make_unique<SokolRenderPath>(points, verbs, rule);
 }
 
 std::unique_ptr<RenderPath> SokolFactory::makeEmptyRenderPath() {
@@ -689,6 +690,11 @@
     BlendMode m_blendMode = BlendMode::srcOver;
 
 public:
+    ~SokolRenderPaint() override {
+        sg_destroy_buffer(m_strokeVertexBuffer);
+        sg_destroy_buffer(m_strokeIndexBuffer);
+    }
+
     void color(ColorInt value) override {
         fillColorBuffer(m_uniforms.colors[0], value);
         m_uniforms.fillType = 0;
@@ -741,7 +747,8 @@
         if (m_shader) {
             static_cast<SokolGradient*>(m_shader.get())->bind(vertexUniforms, m_uniforms);
         }
-        sg_apply_uniforms(SG_SHADERSTAGE_VS, SLOT_vs_params, SG_RANGE_REF(vertexUniforms));
+
+        sg_apply_uniforms(SG_SHADERSTAGE_VS, SLOT_vs_path_params, SG_RANGE_REF(vertexUniforms));
         sg_apply_uniforms(SG_SHADERSTAGE_FS, SLOT_fs_path_uniforms, SG_RANGE_REF(m_uniforms));
         if (m_stroke != nullptr) {
             if (m_strokeDirty) {
@@ -872,7 +879,7 @@
         }
     }
 
-    vs_path_params_t vs_params;
+    vs_path_params_t vs_params = {.fillType = 0};
     fs_path_uniforms_t uniforms = {0};
 
     // Decr any paths from the last clip that are gone.
@@ -933,7 +940,7 @@
     auto sokolPaint = static_cast<SokolRenderPaint*>(paint);
 
     applyClipping();
-    vs_path_params_t vs_params;
+    vs_path_params_t vs_params = {.fillType = 0};
     const Mat2D& world = transform();
 
     vs_params.mvp = m_Projection * world;