external: Use -fPIE when linking

The gcc info page says:

    For predictable results, you must also specify the same set of
    options that were used to generate code (-fpie, -fPIE, or model
    suboptions) when you specify this option [-pie].

The output binary is exactly the same before and after making this change,
but it's probably a good idea to follow the rules anyhow.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Update changelog and bump version to 1.10 (1109)

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>