generate individual c++ makefiles in target dir #47801
Merged
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This generates the c++ makefiles in the target dir rather than under src/cpp, so no files are written under src/cpp during build, and so
cargo clean
will remove all intermediate build files including generated makefiles. As a further simplification, the makefiles are generated individually via multiple qmake invocations rather than by relying on a qmake subdirs project. Also fix make install and move the location of postbuild's pri file to avoid warnings when running make clean.