title: populate_sdk command can't satisfy a nativesdk package I know exists
body: <p>I have a recipe which produces -native and nativesdk- packages, but when I try to populate the SDK I get the following error message:</p>
  <pre><code>~/myproj/build$ bitbake -c populate_sdk core-image-minimal
  ... lots of error messages ...
  Collected errors:
   * opkg_prepare_url_for_install: Couldn't find anything to satisfy 'nativesdk-myapp'.
  </code></pre>
  <p>However, I have no trouble building that package:</p>
  <pre><code>~/myproj/build$ bitbake myapp myapp-native nativesdk-myapp
  </code></pre>
  <p>The recipe in question uses <code>BBCLASSEXTEND</code> to add the extra packages.  It is very simple: just a standard cmake recipe that changes a couple of config parameters to omit unit tests from the native and nativesdk builds:</p>
  <pre><code>inherit cmake
  
  SUMMARY = &quot;My Application&quot;
  SRC_URI = &quot;git://git@bitbucket.mydomain.com/project/myapp&quot;
  S = &quot;${WORKDIR}/git/&quot;
  
  DEPENDS += &quot;gnutls protobuf protobuf-native dlt-daemon&quot;
  DEPENDS_append_class-target = &quot; gtest&quot;
  
  EXTRA_OECMAKE_append_class-native = &quot; -DAPP_FEATURE_TEST=Off&quot;
  EXTRA_OECMAKE_append_class-nativesdk = &quot; -DAPP_FEATURE_TEST=Off&quot;
  
  BBCLASSEXTEND = &quot;native nativesdk&quot;
  </code></pre>
  <p>Finally, I have the following lines in my distro file:</p>
  <pre><code>TOOLCHAIN_TARGET_TASK_append += &quot; myapp-dev nativesdk-myapp&quot;
  </code></pre>
  <p>I can build the nativesdk-myapp package just fine, but for some reason the populate_sdk target can't find it.</p>