Update embedded jsoncpp from unk version to 0.10.6 + move libs to lib/ instead of src/ (#5473)

* Update embedded jsoncpp from unk version to 0.10.6

0.10.6 is last release without c++11

* Make jsoncpp more compliant with its amalgamate

Jsoncpp cpp file should be upper, make the library like it does in amalgamate

* Reorganization: move minetest embedded libs outside of source tree to /lib

* Fix a dead grep in LINT

lib/lua/src/CMakeLists.txt

@@ -0,0 +1,54 @@
+
+# Lua core source files.
+set(LUA_CORE_SRC
+	lapi.c
+	lauxlib.c
+	lbaselib.c
+	lcode.c
+	ldblib.c
+	ldebug.c
+	ldo.c
+	ldump.c
+	lfunc.c
+	lgc.c
+	linit.c
+	liolib.c
+	llex.c
+	lmathlib.c
+	lmem.c
+	loadlib.c
+	lobject.c
+	lopcodes.c
+	loslib.c
+	lparser.c
+	lstate.c
+	lstring.c
+	lstrlib.c
+	ltable.c
+	ltablib.c
+	ltm.c
+	lundump.c
+	lvm.c
+	lzio.c
+)
+set(LUA_LIB_HEADERS
+	lua.h
+	lualib.h
+	lauxlib.h
+	luaconf.h
+)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}
+		${CMAKE_CURRENT_BINARY_DIR})
+
+# Lua library.
+add_library(lua STATIC ${LUA_CORE_SRC})
+target_link_libraries(lua ${LIBS})
+set(LUA_STATIC_LIB lua)
+set(LUA_LIBS lua)
+
+set_target_properties(${LUA_LIBS} PROPERTIES
+	VERSION ${LUA_VERSION}
+	CLEAN_DIRECT_OUTPUT 1
+)
+