meta.tests: drop meta.needsVMSupport

Its job is already handled by `requiredSystemFeatures`

doc/meta.xml

@@ -258,9 +258,8 @@ meta.platforms = stdenv.lib.platforms.linux;
      <para>
       An attribute set with as values tests. A test is a derivation, which
       builds successfully when the test passes, and fails to build otherwise. A
-      derivation that is a test requires some <literal>meta</literal> elements
-      to be defined: <literal>needsVMSupport</literal> (automatically filled-in
-      for NixOS tests) and <literal>timeout</literal>.
+      derivation that is a test needs to have <literal>meta.timeout</literal>
+      defined.
      </para>
      <para>
       The NixOS tests are available as <literal>nixosTests</literal> in
@@ -294,17 +293,6 @@ meta.platforms = stdenv.lib.platforms.linux;
      </para>
     </listitem>
    </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>needsVMSupport</varname>
-    </term>
-    <listitem>
-     <para>
-      A boolan that states whether the derivation requires build-time support
-      for Virtual Machine to build successfully.
-     </para>
-    </listitem>
-   </varlistentry>
    <varlistentry>
     <term>
      <varname>hydraPlatforms</varname>