include: Install include files

The include directory was defined but not installed.

Add it to the meson build structure to incorporate it as part of the
library install.

To facilitate the same include paths in our internal includes, update
the structure for headers to match the install structure.

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/meson.build

@@ -0,0 +1,6 @@
+public_api = [
+	'libcamera.h',
+]
+
+install_headers(public_api,
+                subdir : 'libcamera')

include/meson.build

@@ -0,0 +1 @@
+subdir('libcamera')

meson.build

@@ -4,6 +4,7 @@ project('libcamera - supporting complex camera pipelines', 'c', 'cpp',
 
 inc = include_directories('include')
 
+subdir('include')
 subdir('lib')
 subdir('test')
 subdir('utils')

test/init.cpp

@@ -1,4 +1,4 @@
-#include <libcamera.h>
+#include <libcamera/libcamera.h>
 
 int main(void)
 {