Fix test failues due to C99 warning on macos (Apple clang)

[bjornbm]

This is needed to prevent complilation failure on macos (Apple clang). Exemple of the failure message is shown below.

I guess another option is to avoid the CallInfo redefinitiion on luacore.h line 2386 to make in C99 compliant?

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0 successes / 1 failure / 0 errors / 0 pending : 0.202854 seconds

Failure → spec/traceback_spec.lua @ 31
Rectangle
spec/traceback_spec.lua:11: command failed: pallenec spec/traceback/rect/rect.pln --use-traceback

stack traceback:
        spec/traceback_spec.lua:11: in upvalue 'assert_test'
        spec/traceback_spec.lua:32: in function <spec/traceback_spec.lua:31>

In file included from /tmp/lua_fLecVi:12:
/Users/bjorn/repos/lua/pallene/.localua/include/luacore.h:2386:25: error: redefinition of typedef 'CallInfo' is a C11 feature [-Werror,-Wtypedef-redefinition]
 2386 | typedef struct CallInfo CallInfo;
      |                         ^
/Users/bjorn/repos/lua/pallene/.localua/include/luacore.h:3:25: note: previous definition is here
    3 | typedef struct CallInfo CallInfo;
      |                         ^
1 error generated.
internal error: compiler failed
compilation line: cc -fPIC -O0 -std=c99 -Wall -Werror -Wundef -Wno-unused  -x c -o /tmp/lua_ASuPlq -c /tmp/lua_fLecVi

[bjornbm]

FYI the source of the problem: https://github.com/pallene-lang/lua-internals/blob/4197fc71a7967436d117e3eb17c2aa04a5a5fd57/src/gen-lua-core-h.awk#L22

I guess the awk script could be updated to not include repeated definitions. It would be a bit ad hoc and ugly perhaps, but arguably so is the inclusion at the top?

[bjornbm]

See the proposed fix at pallene-lang/lua-internals#6 instead which avoids the C99 deviation and avoids the need for this change proposed here.