gtksecurememory.c: Don't include unistd.h unconditionally

It is not universally available on non-POSIX systems.

diff --git a/gtk/gtksecurememory.c b/gtk/gtksecurememory.c
index 55db84398b12b1a0286bf06a5248a9586bee287a..5e3978ec282a6baa46e52fcbafc7349022b5ed61 100644 (file)
--- a/gtk/gtksecurememory.c
+++ b/gtk/gtksecurememory.c
@@ -44,7 +44,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
+
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
+
 #include <assert.h>
 
 #ifdef WITH_VALGRIND