[openwrt/openwrt] libusb: Add SourceForge mirror.

[LEDE Commits]

blogic pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/2c4294f78612d038a2b130171fe25ed8e6569bae

commit 2c4294f78612d038a2b130171fe25ed8e6569bae
Author: Rosen Penev <rosenp at gmail.com>
AuthorDate: Tue May 1 14:13:56 2018 -0700

    libusb: Add SourceForge mirror.
    
    SourceForge is still getting updated so might as well have it here.
    
    Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 package/libs/libusb/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/libs/libusb/Makefile b/package/libs/libusb/Makefile
index 362d742..5400821 100644
--- a/package/libs/libusb/Makefile
+++ b/package/libs/libusb/Makefile
@@ -12,7 +12,9 @@ PKG_VERSION:=1.0.22
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
-PKG_SOURCE_URL:=https://github.com/libusb/libusb/releases/download/v$(PKG_VERSION)
+PKG_SOURCE_URL:=\
+  https://github.com/libusb/libusb/releases/download/v$(PKG_VERSION) \
+  @SF/$(PKG_NAME)
 PKG_HASH:=75aeb9d59a4fdb800d329a545c2e6799f732362193b465ea198f2aa275518157
 
 PKG_INSTALL:=1