app-text/highlight: fix USE=verify-sig w/ tests

The tests tarball is fished out of VCS so isn't signed. Only try
to verify the source tarball.

Closes: https://bugs.gentoo.org/930364
Signed-off-by: Sam James <sam@gentoo.org>

app-text/highlight/highlight-4.12.ebuild

@@ -53,6 +53,15 @@ myhlopts=(
 	examples_dir="${EPREFIX}/usr/share/doc/${PF}/extras"
 )
 
+src_unpack() {
+	if use verify-sig ; then
+		# Needed because the testsuite tarball is unsigned
+		verify-sig_verify_detached "${DISTDIR}"/${P}.tar.bz2{,.asc}
+	fi
+
+	default
+}
+
 src_prepare() {
 	default
 

app-text/highlight/highlight-4.9.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -61,6 +61,16 @@ myhlopts=(
 	examples_dir="${EPREFIX}/usr/share/doc/${PF}/extras"
 )
 
+
+src_unpack() {
+	if use verify-sig ; then
+		# Needed because the testsuite tarball is unsigned
+		verify-sig_verify_detached "${DISTDIR}"/${P}.tar.bz2{,.asc}
+	fi
+
+	default
+}
+
 src_prepare() {
 	default