Remove the convexhull compiler option.

PiperOrigin-RevId: 690307675
Change-Id: I62d8213579ad07296ca96de004d39ae012174aa4

src/user/user_init.c

@@ -39,7 +39,6 @@ void mjs_defaultSpec(mjSpec* spec) {
   spec->compiler.eulerseq[0] = 'x';
   spec->compiler.eulerseq[1] = 'y';
   spec->compiler.eulerseq[2] = 'z';
-  spec->compiler.convexhull = 1;
   spec->compiler.usethread = 1;
   spec->compiler.inertiafromgeom = mjINERTIAFROMGEOM_AUTO;
   spec->compiler.inertiagrouprange[1] = mjNGROUP-1;

src/user/user_mesh.cc

@@ -563,7 +563,7 @@ void mjCMesh::Compile(const mjVFS* vfs) {
   }
 
   // make graph describing convex hull
-  if ((model->compiler.convexhull && needhull_) || face_.empty()) {
+  if (needhull_ || face_.empty()) {
     MakeGraph();
   }