When building sac2c on different *UNIX distros, our use of vardic macros
causes GCC to spit out tons and tons of warnings when using the
-pedantic flag.
Compilers like Clang emulate this behavior but provide a flag to
suppress the warnings: -Wno-gnu-zero-variadic-macro-arguments.
At somepoint, GCC adopted this flag but it seems not to be standard, as most distros (even with newer version of GCC) do not support this flag.
This commit removes the -pedantic flag from the build flags, this
allows us to retain some of our macros without ill-effect. However this
means that sac2c is not built to strictly conform to C standard (though
-pedantic does not garantee this anyway). Given that most C compilers
all share the same feature sets and extensions, it seems unnessicary to
include this anymore.
We still use -pedantic in the SAC compiler flags.