Configuration: Make it possible to have an argument file

Configuration: Make it possible to have an argument file

Some compilers / linkers allow arguments to be given in a file instead
of on the command line.  We make it possible to specify this by giving
the compiler / linker flag for it, using the config attribute
'shared_argfileflag'.

This currently only impacts the build of shared libraries, as those
are potentially made up of a massive amount of object files, which has
been reported to overwhelm the command line on some platforms.

Fixes #12797

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12960)