dev-perl/CGI-Fast: Fix missing Test-Deep dependency

This is caused by an upstream packaging issue

Bug: leejo/cgi-fast#17
Package-Manager: Portage-2.3.8, Repoman-2.3.3

dev-perl/CGI-Fast/CGI-Fast-2.120.0.ebuild

@@ -11,7 +11,7 @@ DESCRIPTION="CGI Interface for Fast CGI"
 
 SLOT="0"
 KEYWORDS="~amd64 ~arm ~hppa ~mips ~ppc ~ppc64 ~x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~x86-solaris"
-IUSE=""
+IUSE="test"
 
 RDEPEND="
 	>=dev-perl/CGI-4
@@ -21,6 +21,7 @@ RDEPEND="
 "
 DEPEND="${RDEPEND}
 	virtual/perl-ExtUtils-MakeMaker
+	test? ( dev-perl/Test-Deep )
 "
 
 src_test() {