qemu_pipe: fix Mac build error.
The <hardware/qemu_pipe.h> header was missing an include
that causes the code under development/tools/emulator/opengl
to fail to compile on OS X.
You need to define BUILD_EMULATOR_OPENGL=true in your
environment, otherwise this code doesn't get built yet by default.
Change-Id: Ia1b48c0ab84f493f3c9f95030d9165961069fb6e
diff --git a/include/hardware/qemu_pipe.h b/include/hardware/qemu_pipe.h
index 930228e..000c99e 100644
--- a/include/hardware/qemu_pipe.h
+++ b/include/hardware/qemu_pipe.h
@@ -23,6 +23,7 @@
#include <pthread.h> /* for pthread_once() */
#include <stdlib.h>
#include <stdio.h>
+#include <errno.h>
#ifndef D
# define D(...) do{}while(0)