Update our version of jsoncpp to fix a memory alignment bug in the library.

This upgrades the library to 1.0.0 instead of the most recent release, since more recent releases require exceptions to be enabled.

BUG=skia:4775
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1575973003

Review URL: https://codereview.chromium.org/1575973003
1 file changed