THRIFT-3268: Suppress gnu-zero-variadic-macro-arguments warnings

[kou]

Client: cpp

We can reproduce these warnings by:

CC=clang CXX=clang++ \
  cmake \
    -S . \
    -B ../thrift.build \
    -DWITH_{AS3,JAVA,JAVASCRIPT,NODEJS,PYTHON,C_GLIB}=OFF \
    -DCMAKE_CXX_FLAGS="-Wgnu-zero-variadic-macro-arguments"
cmake --build ../thrift.build

Sample warning:

lib/cpp/src/thrift/TLogging.h:119:13: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments]
  119 |             ##__VA_ARGS__);                                                                        \
      |             ^

• Did you create an Apache Jira ticket? (Request account here, not required for trivial changes)
  • It already exists.
• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
• Did you squash your changes to a single commit? (not required, but preferred)
• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?
  • T_DEBUG("...") is rejected by this change. We need to use T_DEBUG("%s", "...") instead.
• If your change does not involve any code, include [skip ci] anywhere in the commit message to free up build resources.

[Jens-G]

I'm not so sure about this one. Introducing a breaking change (per JIRA label) and looking at the considerations behind (e.g. this SO thread to name just one) that looks to me like a simple but effective way to introduce funny issues.

[kou]

OK. Are you interested in suppressing this warning? If so, I'll look into another approach that doesn't introduce any backward compatibility.
(In the implementation, `T_DEBUG("...") is rejected.)

If you aren't interested in suppressing this warning, I close this. (Should we close https://issues.apache.org/jira/browse/THRIFT-3268 too?)