CMake: Populate list of required include directories for library targets

PUBLIC items will populate the INTERFACE_INCLUDE_DIRECTORIES property of
<target>. This property is a list of public include directories
requirements for a library.

Targets may populate this property to publish the include directories
required to compile against the headers for the target.

vendor/CMakeLists.txt

@@ -18,7 +18,7 @@ list(REMOVE_ITEM LUA "${CMAKE_CURRENT_SOURCE_DIR}/lua/lua/lua.c")    # Do not co
 set(ENGINE_SOURCES ${GLAD} ${LUA})
 
 add_library(${ENGINE}-dependencies ${ENGINE_SOURCES})
-target_include_directories(${ENGINE}-dependencies PRIVATE
+target_include_directories(${ENGINE}-dependencies PUBLIC
 	"glad/include"
 	"lua")
 target_link_libraries(${ENGINE}-dependencies glfw ruc)