implicit declaration of function 'thrift_protocol_decorator_write_message_begin' is invalid in C99

[raziele]

When using Xcode 12, the above error appears.
After some investigation, this is the same bug as https://trac.macports.org/ticket/61252

Steps used to solve the issue:

1. Downloaded patch files from the above link, saved under "patches" and mv to .patch
2. Added "-p0" to the git apply command in the unpack() function in build.sh

I'll try to fix it soon and create a pull request

[raziele]

Moving forward with the build script, it seems "-p0" caused other patches to break.
Looking at the thrift patches, they are missing the "a/" and "b/" prefixes, so I guess they are the ones that need to be modified