[glick2] add defines for older glibc headers that still miss the defines

[Alexander Larsson <alexl src gnome org>]

commit 459fd630c0aac494cb00f325b7210ecdc2f819a3
Author: Stefan Sauer <ensonic users sf net>
Date:   Mon Oct 17 11:25:32 2011 +0200

    add defines for older glibc headers that still miss the defines

 helper.c  |    4 ++++
 session.c |    8 ++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/helper.c b/helper.c
index de085e3..63d2190 100644
--- a/helper.c
+++ b/helper.c
@@ -58,6 +58,10 @@ update_env_var_list (const char *var, const char *item)
     }
 }
 
+#ifndef MS_PRIVATE      /* May not be defined in older glibc headers */
+#define MS_PRIVATE (1<<18) /* change to private */
+#endif
+
 int
 main (int argc,
       char **argv)
diff --git a/session.c b/session.c
index e8f21f7..a5b2362 100644
--- a/session.c
+++ b/session.c
@@ -11,6 +11,14 @@
 #include <pwd.h>
 #include <sched.h>
 
+#ifndef MS_REC          /* May not be defined in older glibc headers */
+#define MS_REC 16384
+#endif
+
+#ifndef MS_SHARED       /* May not be defined in older glibc headers */
+#define MS_SHARED (1<<20) /* change to shared */
+#endif
+
 static const char *
 get_homedir (void)
 {