Add --enable-run-as-root option to configure.

Embedded platforms often only have the root user. Do not, I repeat, Do not enable this option if you don't know what you're doing.

bin/vlc.c

@@ -51,6 +51,7 @@ int main( int i_argc, const char *ppsz_argv[] )
 {
     int i_ret;
 
+#ifndef ALLOW_RUN_AS_ROOT
     if (geteuid () == 0)
     {
         fprintf (stderr, "VLC is not supposed to be run as root. Sorry.\n"
@@ -59,6 +60,7 @@ int main( int i_argc, const char *ppsz_argv[] )
         "cannot be run by non-trusted users first).\n", ppsz_argv[0]);
         return 1;
     }
+#endif
 
     setlocale (LC_ALL, "");
 

configure.ac

@@ -1587,6 +1587,16 @@ if test "${enable_optimizations}" != "no"; then
    fi
 fi
 
+dnl
+dnl Allow runing as root (usefull for people runing on embedded platforms)
+dnl
+AC_ARG_ENABLE(run-as-root,
+[  --enable-run-as-root    allow runing VLC as root (default disabled)])
+AS_IF([test "${enable_run_as_root}" == "yes"],[
+    AC_DEFINE(ALLOW_RUN_AS_ROOT, 1,
+              [Define to 1 to allow runing VLC as root (uid 0).])
+])
+
 dnl
 dnl  Test coverage
 dnl