Revert "libubox: update to the latest version"

This reverts commit def82714d92d124dc5376c340132392ff7a3d4a5.
Needs further fixes

Signed-off-by: Felix Fietkau <[email protected]>

package/libs/libubox/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/libubox.git
-PKG_SOURCE_DATE:=2018-04-07
-PKG_SOURCE_VERSION:=92009b7f989f83f83159a43574ce5e36b7c4d5a1
-PKG_MIRROR_HASH:=08ab34fb2458b75f6ef4e54d7899ea28565ee9f8801cc0c90220ac72cbc5596a
+PKG_SOURCE_DATE:=2018-03-21
+PKG_SOURCE_VERSION:=eebe3fcd2a5728264faa5ae72bbc38d7bb704c8e
+PKG_MIRROR_HASH:=0becfd63c7b2e039bc2f780f183ebb5d3a5f2721ace25d6e7ea8b3ccdeb1ae5a
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC