[tlbuild] MFLua 1.0.0-alpha fails

[Mojca Miklavec]

On Mon, 11 Jan 2021 at 11:55, luigi scarso wrote:
>
> I know the switch , but I don't know if it's a valid  solution for texlive.

I see a bunch of these inside the TL already:

$ grep -r AC_PROG_CC_C99
luajit/configure.ac:AC_PROG_CC_C99
pplib/configure.ac:AC_PROG_CC_C99
gmp/gmp-src/configure.ac:AC_PROG_CC_C99
gmp/configure.ac:AC_PROG_CC_C99
harfbuzz/harfbuzz-src/configure.ac:AC_PROG_CC_C99
lua53/configure.ac:AC_PROG_CC_C99

Mojca