indent: Only use func shiftwidth() if it exists #49
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shiftwidth() is not a builtin function, and my vim mojo isn't strong
enough to know where it could have come from. This change fallbacks to
using &sw instead of the shiftwidth() function, if the latter doesn't
exist.
Fixes Issue #48 in https://github.com/elzr/vim-json