lib/oe/classextend: Fix nativesdk double name mapping

Handle the case a name has already been extended in the nativesdk case
(avoids double name extensions which can happen with nativesdk-gcc).

(From OE-Core rev: 608ceb14ebc144102a0f9c2d449d9cb54b8f77b9)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/classextend.py

@@ -110,6 +110,8 @@ class ClassExtender(object):
 
 class NativesdkClassExtender(ClassExtender):
     def map_depends(self, dep):
+        if dep.startswith(self.extname):
+            return dep
         if dep.endswith(("-gcc-initial", "-gcc", "-g++")):
             return dep + "-crosssdk"
         elif dep.endswith(("-native", "-native-runtime")) or ('nativesdk-' in dep) or ('-cross-' in dep) or ('-crosssdk-' in dep):