-- Add test demonstrating issue
-- In the case of executable targets the target name is usually the same as used in "-o filename"
But for static libraries the target name is usually "-o libname.a"
"gbuild.exe target" will build whatever target matches against even the output from the compiler or linker
But the targets in "cmake --build . --target name" should be target names in CMakeLists.txt not the actual filenames
So change the "name" to "name.gpj" so it matches the target name in CMakeLists.txt.
Fixes#15975
