Squashed 'thirdparty/src/opencc/' changes from 2cdf489..e684f54

e684f54 Bump version to 1.0.2
f9f8db5 Update gitignore and cpack ignore
dc2df95 Fix build errors for C
d2b0dba Fix undefined macro OPENCC_EXPORT in C
93644fe Fix `OPENCC_DEFAULT_CONFIG_SIMP_TO_TRAD`

git-subtree-dir: thirdparty/src/opencc
git-subtree-split: e684f547174d4e1c24fc0d0340e505682aaf01e8
Update opencc to version 1.0.2.