system: expose BR2_ROOTFS_POST_SCRIPT_ARGS for PRE_BUILD scripts

Currently, we pass BR2_ROOTFS_POST_SCRIPT_ARGS to each of the scripts in
BR2_ROOTFS_PRE_BUILD_SCRIPT, but the option is not exposed in menuconfig
when only pre-build scripts are used.

Add the pre-build scripts to the condition exposing the extra args
option.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 96b3295ca1fc00973fa2754dafb80fe6db23f48f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

system/Config.in

@@ -695,12 +695,13 @@ config BR2_ROOTFS_POST_IMAGE_SCRIPT
 
 config BR2_ROOTFS_POST_SCRIPT_ARGS
 	string "Extra arguments passed to custom scripts"
-	depends on BR2_ROOTFS_POST_BUILD_SCRIPT != "" \
+	depends on BR2_ROOTFS_PRE_BUILD_SCRIPT != "" \
+	        || BR2_ROOTFS_POST_BUILD_SCRIPT != "" \
 		|| BR2_ROOTFS_POST_FAKEROOT_SCRIPT != "" \
 		|| BR2_ROOTFS_POST_IMAGE_SCRIPT != ""
 	help
-	  Pass these additional arguments to each post-build or
-	  post-image scripts.
+	  Pass these additional arguments to each pre-build, post-build,
+	  post-fakeroot and post-image scripts.
 
 	  Note that all the post-build and post-image scripts will be
 	  passed the same set of arguments, you can not pass different