[yocto] [meta-yocto][PATCH] poky.conf: Use weaker assignment for PREMIRROR

[Khem Raj]

This is to facilitate distros using poky as reference
so that they can use ?= and provide an option for their
users to override it if desired

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 meta-yocto/conf/distro/poky.conf |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta-yocto/conf/distro/poky.conf b/meta-yocto/conf/distro/poky.conf
index afe328b..963b3dd 100644
--- a/meta-yocto/conf/distro/poky.conf
+++ b/meta-yocto/conf/distro/poky.conf
@@ -44,7 +44,7 @@ TCLIBCAPPEND = ""
 QEMU_TARGETS ?= "arm i386 mips mipsel ppc x86_64"
 # Other QEMU_TARGETS "mips64 mips64el sh4"
 
-PREMIRRORS ?= "\
+PREMIRRORS ??= "\
 bzr://.*/.*   http://downloads.yoctoproject.org/mirror/sources/ \n \
 cvs://.*/.*   http://downloads.yoctoproject.org/mirror/sources/ \n \
 git://.*/.*   http://downloads.yoctoproject.org/mirror/sources/ \n \
-- 
1.7.9.5