[v3] use -Wl,-z,relro if possible

[Benjamin Kosnik]

> However, the new configure test is not yet sufficiently strong to 
> disable the use of gc-sections on my binutils2.16.1 system. I'm 
> available to test further improvements to the configure tests, if you 
> like (remember our timezones, though ;)

Ok. Here, try this one. I'm just guessing, at this point. 

-benjamin
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