procd: jail fixes and improvements

 32c717e jail: only mess with rootfs if CLONE_NEWNS was set
 b275a62 instance: harmonize instance API
 511fd97 jail: make /proc more secure
 4953b7c jail: mount /sys read-only
 a4d6442 jail: replace /etc/resolv.conf with symlink in extroot+overlay
 a4cc165 jail: always mount /dev as additional tmpfs

Signed-off-by: Daniel Golle <[email protected]>

package/system/procd/Makefile

@@ -12,9 +12,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/procd.git
-PKG_SOURCE_DATE:=2020-04-09
-PKG_SOURCE_VERSION:=28a06e55cd4235faf52638dd85709e3da04c5c06
-PKG_MIRROR_HASH:=f747393e2208888fdb15444d0fad354f46e47cccc393fd408e8cb1c51ef1dfc8
+PKG_SOURCE_DATE:=2020-04-14
+PKG_SOURCE_VERSION:=a4cc165a9fdcc9d76a0ba58a2e9ccde605e5f40d
+PKG_MIRROR_HASH:=773585b1616884829d86efe349ac61bc9b9e4a0c46e2ec0ed6ce913cced7806e
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0