obfuscate: add license

packages/o/obfuscate/xmake.lua

@@ -2,6 +2,7 @@ package("obfuscate")
     set_kind("library", {headeronly = true})
     set_homepage("https://github.com/adamyaxley/Obfuscate")
     set_description("Guaranteed compile-time string literal obfuscation header-only library for C++14")
+    set_license("Unlicense")
 
     add_urls("https://github.com/adamyaxley/Obfuscate.git")
     add_versions("2024.02.11", "e65173d617983ce6b714c9ade5a6dbf3503c9a96")