message: Rename pre-compiled gbc when installing
  The pre-compiled gbc may not be called "gbc" if the user specified the
  CMake variable BOND_GBC_PATH, so we need to rename it to gbc when
  installing.
  Closes
diff: @@ -49,7 +49,14 @@ install (EXPORT bond
  # if BOND_GBC_PATH is set we must copy over that gbc to the install location
  if (BOND_GBC_PATH)
  - install (FILES
  - ${BOND_GBC_PATH}
  - DESTINATION bin)
  + if (WIN32)
  + set(INSTALLED_GBC_NAME gbc.exe)
  + else()
  + set(INSTALLED_GBC_NAME gbc)
  + endif()
  +
  + install (
  + FILES ${BOND_GBC_PATH}
  + DESTINATION bin
  + RENAME ${INSTALLED_GBC_NAME})
  endif()
  