[totem-pl-parser] Only include unistd.h if available

[Bastien Nocera <hadess src gnome org>]

commit e40a9f12efeb91f07197448f2e9276f2b6eccb01
Author: Shixin Zeng <zeng shixin gmail com>
Date:   Mon Apr 12 13:11:54 2010 +0100

    Only include unistd.h if available

 plparse/tests/parser.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plparse/tests/parser.c b/plparse/tests/parser.c
index dac0bd0..bca0195 100644
--- a/plparse/tests/parser.c
+++ b/plparse/tests/parser.c
@@ -6,7 +6,9 @@
 #include <gio/gio.h>
 
 #include <string.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif /* HAVE_UNISTD_H */
 #include <stdlib.h>
 #include <time.h>