title: Is it possible to exclude specific build variant when using flavor Dimensions?
body: <p>When using Gradle flavorDimensions, is it possible to exclude specific variants? 
  For example - </p>
  
  <pre><code>android {
  ...
  
  flavorDimensions "abi", "version"
  
  productFlavors {
      freeapp {
          flavorDimension "version"
          ...
      }
  
      x86 {
          flavorDimension "abi"
          ...
      }
  }
  </code></pre>
  
  <p>the following build variants will be created:             </p>
  
  <p>x86-freeapp-debug<br>
  x86-freeapp-release<br>
  arm-freeapp-debug<br>
  arm-freeapp-release<br>
  mips-freeapp-debug<br>
  mips-freeapp-release<br>
  x86-paidapp-debug<br>
  x86-paidapp-release<br>
  arm-paidapp-debug<br>
  arm-paidapp-release<br>
  mips-paidapp-debug<br>
  mips-paidapp-release       </p>
  
  <p>Can "mips-paidapp-release" be manually removed?</p>