fix: Set the appropriate compiler env variables to resolve linking issues

profiles/cura_clang.jinja

@@ -8,3 +8,8 @@ compiler.libcxx=libstdc++11
 
 [conf]
 tools.build:compiler_executables={"c":"{{ compiler_exe }}", "cpp":"{{ compiler_exe }}++"}
+
+[buildenv]
+CC={{ compiler }}
+CXX={{ compiler }}++
+CXXFLAGS=-Wno-error=unused-command-line-argument