message: Better error messages in device.cpp
diff: @@ -37,7 +37,7 @@ void Device::CudaDeviceSetup(const int device)
  #ifdef MFEM_USE_CUDA
  GpuDeviceSetup(device);
  #else
  - MFEM_ABORT("CUDA requested but no GPU support has been built!");
  + MFEM_ABORT("CUDA requested but MFEM was not build with MFEM_USE_CUDA=YES");
  #endif
  }
  @@ -46,7 +46,7 @@ void Device::RajaDeviceSetup(const int device)
  #if defined(MFEM_USE_CUDA) && defined(MFEM_USE_RAJA)
  GpuDeviceSetup(device);
  #elif !defined(MFEM_USE_RAJA)
  - MFEM_ABORT("RAJA requested but no RAJA support has been built!");
  + MFEM_ABORT("RAJA requested but MFEM was not build with MFEM_USE_RAJA=YES");
  #endif
  }
  @@ -70,7 +70,7 @@ void Device::OccaDeviceSetup(CUdevice cu_dev, CUcontext cu_ctx)
  occa::loadKernels();
  occa::loadKernels("fem");
  #else
  - MFEM_ABORT("OCCA requested but no support has been built!");
  + MFEM_ABORT("OCCA requested but MFEM was not build with MFEM_USE_OCCA=YES");
  #endif
  }
  @@ -87,7 +87,7 @@ void Device::MFEMDeviceSetup(const int dev)
  if (cuda && ngpu==0)
  {
  - MFEM_ABORT("CUDA requested but no GPU has been initialized!");
  + MFEM_ABORT("CUDA requested but MFEM was not build with MFEM_USE_CUDA=YES");
  }
  }
  