xshared: Introduce struct argv_store

The use of global variables in code around add_argv() is error-prone and
hard to follow. Replace them by a struct which functions will modify
instead of causing side-effects.

Given the lack of static variables, this effectively makes argv
construction code reentrant.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Florian Westphal <fw@strlen.de>

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