Refix InfiniBand build.
Refix InfiniBand build.

    [ ] May break build
    [ ] May break existing applications (see CHANGES.txt)
    [x] Bugfix
    [ ] New Feature
    [ ] Cleanup
    [ ] Optimization
    [ ] Documentation

Suprisingly rdma_verbs.h is not always there, simply inline the few helper
routines into our codebase.

CMakeLists also needed to be set inline with the plural form of include dirs
found by cmake scripts.

jafyvilla/CMake,ptoharia/CMake,tribal-tec/vmmlib,biddisco/CMake,rballester/vmmlib,shurikasa/CMake,jafyvilla/CMake,BlueBrain/Tuvok,biddisco/CMake,shuaibarshad/KAUST-CMake,biddisco/CMake,hernando/vmmlib,shuaibarshad/KAUST-CMake,biddisco/CMake,BlueBrain/Tuvok,hernando/vmmlib,jafyvilla/CMake,jafyvilla/CMake,rballester/vmmlib,BlueBrain/Tuvok,shurikasa/CMake,rballester/vmmlib,ptoharia/CMake,shuaibarshad/KAUST-CMake,shurikasa/CMake,shuaibarshad/KAUST-CMake,ptoharia/CMake,hernando/vmmlib,shurikasa/CMake,ptoharia/CMake