Add -lm to C++

Author: pascalecu

archive/c/c-plus-plus/testinfo.yml

@@ -5,5 +5,5 @@ folder:
 container:
   image: "gcc"
   tag: "15.2"
-  build: "g++ -std=c++23 -pthread -o {{ source.name }} {{ source.name }}{{ source.extension }}"
+  build: "g++ -std=c++23 -pthread -lm -o {{ source.name }} {{ source.name }}{{ source.extension }}"
   cmd: "./{{ source.name }}"