trace: Include the appropriate header instead of defining prototypes.

Avoids header when the header was included before.

diff --git a/src/gallium/drivers/trace/tr_rbug.c b/src/gallium/drivers/trace/tr_rbug.c
index 0546aad9b508759693c3a9748b0500e32579c4f2..d66a75c6c8734cbe5b76a0296f2b8c18727cfe87 100644 (file)
--- a/src/gallium/drivers/trace/tr_rbug.c
+++ b/src/gallium/drivers/trace/tr_rbug.c
@@ -46,7 +46,7 @@
 #if defined(PIPE_SUBSYSTEM_WINDOWS_USER)
 #  define sleep Sleep
 #elif defined(PIPE_OS_LINUX) || defined(PIPE_OS_APPLE)
-void usleep(int);
+#  include <unistd.h>
 #  define sleep usleep
 #else
 #  warning "No socket implementation"