Fix #1616.

Don't build the 3ds Max plugin in external release builds. External
releases don't include Age creation plugins, they are just for players.
Further, some of the security lockdowns break critical plugin features.

CMakeLists.txt

@@ -168,7 +168,7 @@ endif(PLASMA_PIPELINE_METAL)
 
 # Allow us to disable certain parts of the build
 option(PLASMA_BUILD_CLIENT "Do we want to build plClient?" ON)
-cmake_dependent_option(PLASMA_BUILD_MAX_PLUGIN "Do we want to build the 3ds Max plugin?" OFF "TARGET 3dsm" OFF)
+cmake_dependent_option(PLASMA_BUILD_MAX_PLUGIN "Do we want to build the 3ds Max plugin?" OFF "TARGET 3dsm AND NOT PLASMA_EXTERNAL_RELEASE" OFF)
 option(PLASMA_BUILD_LAUNCHER "Do we want to build plUruLauncher?" ON)
 option(PLASMA_BUILD_TOOLS "Do we want to build the Plasma tools?" ON)
 option(PLASMA_BUILD_TESTS "Do we want to build the unit tests?" OFF)