Split arguments taking quotes into account

Split arguments taking quotes into account

CA.pl supports interpolating multiple arguments into the executed
commands.  Previously these were evaluated by a shell, which supported
quoting of values that contain whitespace, backslashes, ...

With a shell no longer used (avoid command injection), backwards
compatibility requires some similar functionality.  The code now handles
double and single-quoted strings (shell-style word splitting), but not
parameter expansion ($foo remains unexpanded) or command substitution
(`cmd` and $(cmd) remain unexpanded).

On Windows system(@LIST) does not correctly preserve argv, do our
own quoting instead and use system(<$quoted_cmd>).

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27432)