chore use std::getenv Not c style getenv

idea from: https://github.com/debauchee/barrier/pull/847/

src/lib/arch/unix/ArchDaemonUnix.cpp

@@ -41,7 +41,7 @@ int execSelfNonDaemonized()
 
 bool alreadyDaemonized()
 {
-  return getenv("_DESKFLOW_DAEMONIZED") != nullptr;
+  return std::getenv("_DESKFLOW_DAEMONIZED") != nullptr;
 }
 
 #endif