add x11 libraries for raylib as glfw make private (#5625)

src/CMakeLists.txt

@@ -117,6 +117,21 @@ target_include_directories(raylib
 
 # Copy the header files to the build directory for convenience
 file(COPY ${raylib_public_headers} DESTINATION "include")
+if (PLATFORM STREQUAL "Desktop")
+    if (UNIX AND NOT APPLE)
+        if (GLFW_BUILD_X11)
+            find_package(X11 REQUIRED)
+
+            target_compile_definitions(raylib PRIVATE _GLFW_X11)
+
+            target_link_libraries(raylib PRIVATE 
+                ${X11_LIBRARIES}
+            )
+            
+            message(STATUS "X11 support enabled for raylib")
+        endif()
+    endif()
+endif()
 
 # Includes information on how the library will be installed on the system
 # when cmake --install is run