Rename zalloc.h to libweston/zalloc.h

It is a public installed header used by libweston.h.

See "Rename compositor.h to libweston/libweston.h" for rationale.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
diff --git a/libweston/touch-calibration.c b/libweston/touch-calibration.c
index d6f2160..b346d90 100644
--- a/libweston/touch-calibration.c
+++ b/libweston/touch-calibration.c
@@ -31,7 +31,7 @@
 
 #include "shared/helpers.h"
 #include "shared/string-helpers.h"
-#include "shared/zalloc.h"
+#include <libweston/zalloc.h>
 #include "shared/timespec-util.h"
 #include <libweston/libweston.h>