Merge branch 'jh/string-list-micro-optim'

The string-list API used a custom reallocation strategy that was
very inefficient, instead of using the usual ALLOC_GROW() macro,
which has been fixed.

* jh/string-list-micro-optim:
string-list: use ALLOC_GROW macro when reallocing string_list

diff --cc string-list.c
Simple merge