[gnome-continuous] Revert "manifest: Upgrade libusb to 1.0.20"

[Javier Jardón Cabezas <jjardon src gnome org>]

commit 0081d065ebd09b4c16669fb99e765c69a47924bd
Author: Javier Jardón <jjardon gnome org>
Date:   Thu Dec 10 15:44:06 2015 +0000

    Revert "manifest: Upgrade libusb to 1.0.20"
    
    This reverts commit 203353f9a26e5c18bde315cc74256413dbc70688.
    
    libusb fails to build:
    http://build.gnome.org/continuous/buildmaster/builds/2015/12/10/27/build/log-libusb.txt

 manifest.json |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index cc8a9bd..d653c4a 100644
--- a/manifest.json
+++ b/manifest.json
@@ -119,7 +119,7 @@
                {"src": "gnome:libgudev"},
 
                {"src": "git:https://github.com/libusb/libusb.git";,
-                "tag": "v1.0.20"},
+                "tag": "v1.0.19"},
 
                {"src": "git:git://github.com/gregkh/usbutils.git",
                 "patches": ["usbutils-autogen.patch"]},