Allow nvq++ for other filenames as *.cpp

[diehlpk]

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Describe the feature

In the current version, the files passed to nvq++ needs to end with .cpp. For any other file ending, we get the following error

nvq++ test.cc                  
mv: cannot stat 'test.cc.ll': No such file or directory
ld.lld: error: undefined symbol: main
>>> referenced by /lib/aarch64-linux-gnu/Scrt1.o:(_start)
>>> referenced by /lib/aarch64-linux-gnu/Scrt1.o:(_start)
clang-16: error: linker command failed with exit code 1 (use -v to see invocation)
failed: "/usr/local/llvm/bin/clang++ --ld-path=/usr/local/llvm/bin/ld.lld -Wl,-rpath,/opt/nvidia/cudaq/lib -Wl,-rpath,/opt/nvidia/cudaq/lib/plugins -Wl,-rpath,/home/git/distributed-quantum-simualtor/build -L/opt/nvidia/cudaq/lib -L/opt/nvidia/cudaq/lib/plugins test.cc.o -lcudaq -lcudaq-common -lcudaq-ensmallen -lcudaq-nlopt -lcudaq-spin -lcudaq-comm-plugin -lcudaq-pyscf -lcudaq-mlir-runtime -lcudaq-builder -lcudaq-em-default -lcudaq-platform-default -lnvqir -lnvqir-qpp"

[diehlpk]

Ok, that might be an issue for cmake, since CMake uses .cxx to check if the compiler works

CMake Error at /usr/share/cmake-3.22/Modules/CMakeTestCXXCompiler.cmake:62 (message):
  The C++ compiler

    "/opt/nvidia/cudaq/bin/nvq++"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /home/git/distributed-quantum-simualtor/build/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_86ba7/fast && /usr/bin/gmake  -f CMakeFiles/cmTC_86ba7.dir/build.make CMakeFiles/cmTC_86ba7.dir/build
    gmake[1]: Entering directory '/home/git/distributed-quantum-simualtor/build/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_86ba7.dir/testCXXCompiler.cxx.o