general-functions.pl: Explicitely call new system function

general-functions.pl: Explicitely call new system function

Perl seems to just "guess" that someone no longer wants to use the
builtin "system" command when there is a function with the same name.

I have no idea what kind of liquid they are drinking, but because of the
side effects of that stuff, we explicitely call our system() function.

Not that that would be necessary, but why not waste a couple more CPU
cycles?

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>