Rename src/ to libweston/

This clarifies what is supposed to be the libweston code.

v2: screen-share.c is already in compositor/ instead.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Tested-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Tested-by: Benoit Gschwind <gschwind@gnu-log.net>
Acked-by: Benoit Gschwind <gschwind@gnu-log.net>
[Pekka: rebased]

diff --git a/tests/vertex-clip-test.c b/tests/vertex-clip-test.c
index 8a4e5a6..ce876ce 100644
--- a/tests/vertex-clip-test.c
+++ b/tests/vertex-clip-test.c
@@ -31,7 +31,7 @@
 #include "weston-test-runner.h"
 
 #include "shared/helpers.h"
-#include "src/vertex-clipping.h"
+#include "vertex-clipping.h"
 
 #define BOUNDING_BOX_TOP_Y 100.0f
 #define BOUNDING_BOX_LEFT_X 50.0f