Allow setting absolute paths for CMAKE_INSTALL_BINDIR
Allow setting absolute paths for CMAKE_INSTALL_BINDIR

By default, this variable is set to "bin", denoting a path within
CMAKE_INSTALL_PREFIX. It may also be an absolute path which is currently
not considered in the post-install scripts.

ornladios/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2,JasonRuonanWang/ADIOS2,JasonRuonanWang/ADIOS2,ornladios/ADIOS2