Remove the convexhull compiler option.

PiperOrigin-RevId: 690307675
Change-Id: Ic0a7e4f96a99fc9159c4e8c39e9220638b400452

Author: yuvaltassa

dm_control/mjcf/schema.xml

@@ -19,7 +19,6 @@
         <attribute name="texturedir" type="basepath" path_namespace="texture" conflict_allowed="true"/>
         <attribute name="assetdir" type="basepath" path_namespace="asset" conflict_allowed="true"/>
         <attribute name="discardvisual" type="keyword" valid_values="false true"/>
-        <attribute name="convexhull" type="keyword" valid_values="false true"/>
         <attribute name="userthread" type="keyword" valid_values="false true"/>
         <attribute name="fusestatic" type="keyword" valid_values="false true"/>
         <attribute name="inertiafromgeom" type="keyword" valid_values="false true auto"/>