openocd: add fallback repository mirror

Add a fallback mirror for the openocd repository fetch
process, so that if the primary source repo.or.cz is unavailable,
the build system will attempt to download the source code from the gitHub
mirror.

Signed-off-by: Joao Lima <joao.lima@hbkworld.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/openocd/openocd_git.bb

@@ -4,6 +4,10 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=599d2d1ee7fc84c0467b3d19801db870"
 DEPENDS = "libusb-compat libftdi"
 RDEPENDS:${PN} = "libusb1"
 
+MIRRORS += " \
+    git://repo.or.cz/openocd.git git://github.com/openocd-org/openocd.git \
+"
+
 SRC_URI = " \
     git://repo.or.cz/openocd.git;protocol=http;name=openocd;branch=master \
     git://repo.or.cz/r/git2cl.git;protocol=http;destsuffix=tools/git2cl;name=git2cl;branch=master \