[source] kernel: fix module dependency checking

[LEDE Commits]

neoraider pushed a commit to source.git, branch master:
https://git.lede-project.org/c50ba61cafa616becf43e6a0148abea42935e03b

commit c50ba61cafa616becf43e6a0148abea42935e03b
Author: Matthias Schiffer <mschiffer at universe-factory.net>
AuthorDate: Fri Sep 30 22:40:06 2016 +0200

    kernel: fix module dependency checking
    
    Since the kernel makefile is using .ONESHELL, we need to add -e to
    .SHELLFLAGS so errors are not ignored.
    
    Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
---
 package/kernel/linux/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/kernel/linux/Makefile b/package/kernel/linux/Makefile
index d85ce49..21381c7 100644
--- a/package/kernel/linux/Makefile
+++ b/package/kernel/linux/Makefile
@@ -19,6 +19,7 @@ PKG_LICENSE_FILES:=
 
 export SHELL:=/bin/sh
 .ONESHELL:
+.SHELLFLAGS = -ec
 
 include $(INCLUDE_DIR)/package.mk