Extend sign-compare warnings to gcc (take 2)
Remove `-Wno-sign-compare` option for GCC
Suppress erroneous sign-compare warning in `c10::greater_than_max`(see https://godbolt.org/z/Tr3Msnz99)
Fix sign-compare in torch/deploy, `caffe2::QTensor::dim32()` and `generate_proposals_op_test.cc`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75544
Approved by: https://github.com/osalpekar
