[source] x86: image: drop unused ROOTDELAY variable

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/9a267e6a4b08d1fa2a98523e5eb9f2325c9506e2

commit 9a267e6a4b08d1fa2a98523e5eb9f2325c9506e2
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Sat Mar 11 23:03:11 2017 +0100

    x86: image: drop unused ROOTDELAY variable
    
    It's unused since commit 742700719303 ("x86: remove the olpc subtarget,
    it has been unmaintained for a long time").
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 target/linux/x86/image/Makefile | 2 --
 1 file changed, 2 deletions(-)

diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
index 965737a..a2df0af 100644
--- a/target/linux/x86/image/Makefile
+++ b/target/linux/x86/image/Makefile
@@ -97,8 +97,6 @@ ifneq ($(CONFIG_GRUB_IMAGES),)
   endef
 endif
 
-ROOTDELAY=10
-
 define Image/Build/squashfs
 	dd if=/dev/zero bs=128k count=1 >> $(KDIR)/root.squashfs
 endef