Revert "gnu: nss, nss-certs: Update to 3.29.3."

Hydra failed to build this version. See discussion at
https://lists.gnu.org/archive/html/guix-devel/2017-03/msg00408.html.

This reverts commit 4f3dcdd99b.

gnu/packages/certs.scm

@@ -74,7 +74,7 @@
 (define-public nss-certs
   (package
     (name "nss-certs")
-    (version "3.29.3")
+    (version "3.29.2")
     (source (origin
               (method url-fetch)
               (uri (let ((version-with-underscores
@@ -85,7 +85,7 @@
                       "nss-" version ".tar.gz")))
               (sha256
                (base32
-                "1sz1r2iml9bhd4iqiqz75gii855a25895vpy9scjky0y4lqwrp9m"))))
+                "149807rmzb76hnh48rw4m9jw83iw0168njzchz0hmbsgc8mk0i5w"))))
     (build-system gnu-build-system)
     (outputs '("out"))
     (native-inputs

gnu/packages/gnuzilla.scm

@@ -186,7 +186,7 @@ in the Mozilla clients.")
 (define-public nss
   (package
     (name "nss")
-    (version "3.29.3")
+    (version "3.29.2")
     (source (origin
               (method url-fetch)
               (uri (let ((version-with-underscores
@@ -197,7 +197,7 @@ in the Mozilla clients.")
                       "nss-" version ".tar.gz")))
               (sha256
                (base32
-                "1sz1r2iml9bhd4iqiqz75gii855a25895vpy9scjky0y4lqwrp9m"))
+                "149807rmzb76hnh48rw4m9jw83iw0168njzchz0hmbsgc8mk0i5w"))
               ;; Create nss.pc and nss-config.
               (patches (search-patches "nss-pkgconfig.patch"))))
     (build-system gnu-build-system)