Fix a bunch of minor build and test issues.

Antonio Sánchezrequested to merge
cantonios/eigen:fixit into master
  • SPQRSupport included a header with the wrong relative path
  • minmax visitor is only vectorized if vectorized comparisons are available
  • half_float/bfloat16_float included a superfluous internal header
  • gpu_basic/gpu_example didn't properly define EIGEN_USE_GPU, which meant GPU packets weren't actually used
  • incomplete_cholesky/sparselu included unused "unsupported" headers
  • sparse_extra unnecessarily duplicated the original sparse_product test

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