Revert "sci-libs/tensorflow: drop unneeded dep for zip"

This reverts commit 48e9fe547f.

These ones need to be the exact archives specified in the WORKSPACE
file.

Bazel fetches distfiles and verifies the hashes match. Switching zips to
tarballs will mean the filenames and hashes are wrong so bazel will fall
back to fetching from the internet, which breaks with network-sandbox.

Signed-off-by: Jason Zaman <perfinion@gentoo.org>

sci-libs/tensorflow/tensorflow-1.15.0.ebuild

@@ -101,6 +101,7 @@ PDEPEND="python? (
 		=sci-libs/tensorflow-estimator-1*[${PYTHON_USEDEP}]
 	)"
 BDEPEND="
+	app-arch/unzip
 	>=dev-libs/protobuf-3.6.0
 	dev-java/java-config
 	dev-python/mock

sci-libs/tensorflow/tensorflow-2.0.0.ebuild

@@ -101,6 +101,7 @@ PDEPEND="python? (
 		>=sci-libs/tensorflow-estimator-2.0.0[${PYTHON_USEDEP}]
 	)"
 BDEPEND="
+	app-arch/unzip
 	>=dev-libs/protobuf-3.6.0
 	dev-java/java-config
 	dev-python/mock

sci-libs/tensorflow/tensorflow-2.1.0_rc0.ebuild

@@ -106,6 +106,7 @@ PDEPEND="python? (
 		>=sci-libs/tensorflow-estimator-2.0.0[${PYTHON_USEDEP}]
 	)"
 BDEPEND="
+	app-arch/unzip
 	>=dev-libs/protobuf-3.8.0
 	dev-java/java-config
 	dev-lang/swig