Add memory sanitizer flag to build_oai and fix some bugs

• add --sanitize-memory flag to build_oai. Note: you need to build with clang, gcc has no memory sanitizer. Build like this

  CC=/usr/bin/clang CXX=/usr/bin/clang++ ./build_oai ... --sanitize-memory

• fix linking issues in some libraries this leads to ODR violations, so there is now a separate patch that has to be applied before building with memory sanitizer
• correctly initialize heap memory for TDL models (this might improve the behavior of nr_ulsim)
• correctly initialize memory in PUCCH decoder
• tested:
  • works:
    • pucchsim
    • smallblocktest
    • ldpctest
    • polartest
    • nr_dlschsim
    • nr_ulschsim
    • nr_pbchsim
    • nr_prachsim except one that fails with segfault?
  • could not test:
    • nr_dlsim, nr_ulsim because of this error:
  • problem: config module is not correctly loaded, so you cannot run nr-softmodem or nr-uesoftmodem.