elektra: Switch to Lua 5.3

After the introduction of Lua 5.3 to OpenWrt, elektra picks it up instead
of 5.1. Since 5.1 is unsupported anyway, switch to 5.3.

Added liblua to PKG_BUILD_DEPENDS as the FindLua script is broken. Having
it here allows compilation to continue.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/elektra/Makefile

@@ -15,7 +15,7 @@ PKG_NAME:=elektra
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE.md
 PKG_VERSION:=0.8.21
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 # Use this for official releasees
 PKG_HASH:=51892570f18d1667d0da4d0908a091e41b41c20db9835765677109a3d150cd26
@@ -29,7 +29,8 @@ PKG_SOURCE_URL:=http://ftp.libelektra.org/ftp/elektra/releases
 #PKG_SOURCE_VERSION:=e97efb29a94f3a49cb952d06552fcf53708ea8c7
 #PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.xz
 
-PKG_BUILD_DEPENDS:=elektra/host swig/host
+HOST_BUILD_DEPENDS:=swig/host
+PKG_BUILD_DEPENDS:=elektra/host lua
 
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/host-build.mk
@@ -261,7 +262,7 @@ endef
 define Package/libelektra-lua
   $(call Package/libelektra/Default)
   TITLE:=Elektra lua plugin
-  DEPENDS:=+libelektra-core +lua +libstdcpp
+  DEPENDS:=+libelektra-core +lua5.3 +libstdcpp
 endef
 
 define Package/libelektra-lua/description