fix CentOS compilation
The following was not working properly:
    ./build_oai -I -w USRP
After this commit it works.
And so does:
  ./build_oai --eNB -w USRP
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The following was not working properly:
    ./build_oai -I -w USRP
After this commit it works.
And so does:
  ./build_oai --eNB -w USRP
