[Build] Added missing gRPC_BUILD_CODEGEN (#32986)

Fixes https://github.com/grpc/grpc/issues/32885

CMakeLists.txt

@@ -26257,10 +26257,12 @@ if(gRPC_INSTALL)
     DESTINATION ${gRPC_INSTALL_CMAKEDIR}
     NAMESPACE gRPC::
   )
-  install(EXPORT gRPCPluginTargets
+  if(gRPC_BUILD_CODEGEN)
-    DESTINATION ${gRPC_INSTALL_CMAKEDIR}
+    install(EXPORT gRPCPluginTargets
-    NAMESPACE gRPC::
+      DESTINATION ${gRPC_INSTALL_CMAKEDIR}
-  )
+      NAMESPACE gRPC::
+    )
+  endif()
 endif()
 
 include(CMakePackageConfigHelpers)

templates/CMakeLists.txt.template

@@ -812,10 +812,12 @@
       DESTINATION <%text>${gRPC_INSTALL_CMAKEDIR}</%text>
       NAMESPACE gRPC::
     )
-    install(EXPORT gRPCPluginTargets
+    if(gRPC_BUILD_CODEGEN)
-      DESTINATION <%text>${gRPC_INSTALL_CMAKEDIR}</%text>
+      install(EXPORT gRPCPluginTargets
-      NAMESPACE gRPC::
+        DESTINATION <%text>${gRPC_INSTALL_CMAKEDIR}</%text>
-    )
+        NAMESPACE gRPC::
+      )
+    endif()
   endif()
 
   include(CMakePackageConfigHelpers)