Nobits sections are no longer relocated

[Mr-Wiseguy]

As of a8d71f0, which came from #240, sections marked with SHT_NOBITS are no longer relocated. This is incorrect, as SHT_NOBITS only means that the section isn't supposed to end up in the resulting binary. Virtual addresses should still be relocated, otherwise .bss sections from compiled C code will have invalid addresses compared to the other sections imported from the same object file.