log: Only include unistd.h if configure found it

MSVC has isatty (in io.h), but not unistd.h. (isatty isn't called
at all for windows, since there's a special case block for that.)

Signed-off-by: Martin Storsjö <martin@martin.st>

diff --git a/libavutil/log.c b/libavutil/log.c
index e4a9fec..e2773d4 100644 (file)
--- a/libavutil/log.c
+++ b/libavutil/log.c
@@ -26,7 +26,7 @@
 
 #include "config.h"
 
-#if HAVE_ISATTY
+#if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #include <stdlib.h>