[PATCH v4 0/2] C99: remove dead !HAVE_VARIADIC_MACROS code

I trivial re-roll of v2: https://lore.kernel.org/git/cover-v3-0.3-00000000000-20220219T103752Z-avarab@gmail.com/

The only change is removing the 3rd patch, per Junio's feedback.

Ævar Arnfjörð Bjarmason (2):
  git-compat-util.h: clarify GCC v.s. C99-specific in comment
  C99: remove hardcoded-out !HAVE_VARIADIC_MACROS code

 Documentation/CodingGuidelines |   3 +
 banned.h                       |   5 --
 git-compat-util.h              |  16 +----
 trace.c                        |  80 +--------------------
 trace.h                        | 128 +++++++++++++++------------------
 trace2.c                       |  39 ----------
 trace2.h                       |  25 -------
 usage.c                        |  15 +---
 8 files changed, 65 insertions(+), 246 deletions(-)

Range-diff against v3: 1: 1a15fe4fd74 = 1: 1a15fe4fd74 git-compat-util.h: clarify GCC v.s. C99-specific in comment 2: bd0f969be55 = 2: bd0f969be55 C99: remove hardcoded-out !HAVE_VARIADIC_MACROS code 3: 27ea260bbea < -: ----------- trace.h: remove never-used TRACE_CONTEXT