libubox: utils: introduce mkdir_p

Add new utility function mkdir_p(char *path, mode_t mode) to replace
the partially buggy implementations found accross fstools and procd.

Signed-off-by: Daniel Golle <[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_MIRROR_HASH:=cf963b19f5a25da85b2d8888514cbcc33c3f641c4478c9c25312b8bf83fe9e6b
-PKG_SOURCE_DATE:=2020-08-06
-PKG_SOURCE_VERSION:=9e52171d70def760a6949676800d0b73f85ee22d
+PKG_MIRROR_HASH:=97dc4eba01cf2c5d6a6d0db3747e0cdc0d95cb87e51b3115272e7d3e69a8b255
+PKG_SOURCE_DATE:=2020-12-12
+PKG_SOURCE_VERSION:=357877693ca363b12e6e7e14d345639b2440cd07
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC
@@ -27,7 +27,7 @@ define Package/libubox
   SECTION:=libs
   CATEGORY:=Libraries
   TITLE:=Basic utility library
-  ABI_VERSION:=20191228
+  ABI_VERSION:=20201212
   DEPENDS:=
 endef