Make sure we use the POSIX basename rather than GNU's

When we include libgen.h, POSIX's basename will be used rather than
GNU's. Since we don't use the special functionalities of GNU's variant
anyway, this helps to compile it on POSIX-compliant libc's like Musl.

https://www.man7.org/linux/man-pages/man3/basename.3.html

src/launcherlib/daemon.cpp

@@ -43,6 +43,7 @@
 #include <stdexcept>
 #include <fstream>
 #include <sstream>
+#include <libgen.h>
 #include <stdlib.h>
 #include <systemd/sd-daemon.h>
 #include <unistd.h>
@@ -979,7 +980,8 @@ void Daemon::parseArgs(int argc, char **argv)
 // Prints the usage and exits with given status
 void Daemon::usage(const char *name, int status)
 {
-    name = basename(name);
+    char *nameCopy = strdup(name);
+    name = basename(nameCopy);
     printf("\n"
            "Start the application launcher daemon.\n"
            "\n"
@@ -1008,6 +1010,8 @@ void Daemon::usage(const char *name, int status)
            "\n",
            name, name, name);
 
+    free(nameCopy);
+
     exit(status);
 }