[build] Make the default styles part of GL Native

The reason is applications using it, like GLFW, don't need
to depend on code inside platform/default.

cmake/glfw.cmake

@@ -12,7 +12,6 @@ target_sources(mbgl-glfw
     PRIVATE platform/glfw/glfw_renderer_frontend.cpp
     PRIVATE platform/glfw/settings_json.hpp
     PRIVATE platform/glfw/settings_json.cpp
-    PRIVATE platform/default/include/mbgl/util/default_styles.hpp
 )
 
 target_include_directories(mbgl-glfw

cmake/offline.cmake

@@ -2,10 +2,6 @@ add_executable(mbgl-offline
     bin/offline.cpp
 )
 
-target_sources(mbgl-offline
-    PRIVATE platform/default/include/mbgl/util/default_styles.hpp
-)
-
 target_include_directories(mbgl-offline
     PRIVATE platform/default/include
 )

platform/ios/core-files.json

@@ -25,8 +25,7 @@
         "mbgl/gfx/headless_backend.hpp": "platform/default/include/mbgl/gfx/headless_backend.hpp",
         "mbgl/gfx/headless_frontend.hpp": "platform/default/include/mbgl/gfx/headless_frontend.hpp",
         "mbgl/gl/headless_backend.hpp": "platform/default/include/mbgl/gl/headless_backend.hpp",
-        "mbgl/map/map_snapshotter.hpp": "platform/default/include/mbgl/map/map_snapshotter.hpp",
-        "mbgl/util/default_styles.hpp": "platform/default/include/mbgl/util/default_styles.hpp"
+        "mbgl/map/map_snapshotter.hpp": "platform/default/include/mbgl/map/map_snapshotter.hpp"
     },
     "private_headers": {
         "CFHandle.hpp": "platform/darwin/src/CFHandle.hpp"

platform/qt/qt.cmake

@@ -75,7 +75,6 @@ add_library(qmapboxgl SHARED
     platform/qt/src/qmapboxgl_renderer_backend.hpp
     platform/qt/src/qmapboxgl_scheduler.cpp
     platform/qt/src/qmapboxgl_scheduler.hpp
-    platform/default/include/mbgl/util/default_styles.hpp
 )
 
 target_include_directories(qmapboxgl

src/core-files.json

@@ -463,6 +463,7 @@
         "mbgl/util/compression.hpp": "include/mbgl/util/compression.hpp",
         "mbgl/util/constants.hpp": "include/mbgl/util/constants.hpp",
         "mbgl/util/convert.hpp": "include/mbgl/util/convert.hpp",
+        "mbgl/util/default_styles.hpp": "include/mbgl/util/default_styles.hpp",
         "mbgl/util/enum.hpp": "include/mbgl/util/enum.hpp",
         "mbgl/util/event.hpp": "include/mbgl/util/event.hpp",
         "mbgl/util/exception.hpp": "include/mbgl/util/exception.hpp",