libcamera/base: Validate internal headers as private

Headers which must not be exposed as part of the public libcamera API
should include base/private.h.

Any interface which includes the private.h header will only be able to
build if the libcamera_private dependency is used (or the
libcamera_base_private dependency directly).

Build targets which are intended to use the private API's will use the
libcamera_private to handle the automatic definition of the inclusion
guard.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/serialization/generated_serializer/meson.build

@@ -8,7 +8,7 @@ exe = executable('generated_serializer_test',
                      generated_test_header,
                      generated_test_serializer,
                  ],
-                 dependencies : libcamera_dep,
+                 dependencies : libcamera_private,
                  link_with : test_libraries,
                  include_directories : [
                      test_includes_internal,

test/serialization/meson.build

@@ -9,7 +9,7 @@ serialization_tests = [
 
 foreach t : serialization_tests
     exe = executable(t[0], [t[1], 'serialization_test.cpp'],
-                     dependencies : libcamera_dep,
+                     dependencies : libcamera_private,
                      link_with : test_libraries,
                      include_directories : test_includes_internal)
     test(t[0], exe, suite : 'serialization', is_parallel : true)