meson: include VkLayer_MESA_anti_lag in the devenv

See https://github.com/KhronosGroup/Vulkan-Loader/blob/main/docs/LoaderLayerInterface.md#linux-layer-discovery

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36346>

src/vulkan/anti-lag-layer/VkLayer_MESA_anti_lag.json.in

@@ -3,7 +3,7 @@
    "layer": {
       "name": "VK_LAYER_MESA_anti_lag",
       "type": "GLOBAL",
-      "library_path": "libVkLayer_MESA_anti_lag.so",
+      "library_path": "@library_path@",
       "api_version": "1.4.303",
       "implementation_version": "1",
       "description": "Open-source implementation of the VK_AMD_anti_lag extension.",
@@ -23,4 +23,4 @@
          "DISABLE_LAYER_MESA_ANTI_LAG": "1"
       }
    }
-}
+}

src/vulkan/anti-lag-layer/meson.build

@@ -6,7 +6,7 @@ vklayer_files = files(
   'anti_lag_layer_interface.c',
 )
 
-shared_library(
+vklayer_mesa_anti_lag = shared_library(
   'VkLayer_MESA_anti_lag',
   vklayer_files,
   c_args : [no_override_init_args],
@@ -19,8 +19,18 @@ shared_library(
   install : true
 )
 
-install_data(
-  files('VkLayer_MESA_anti_lag.json'),
+configure_file(
+  configuration : {'library_path' : 'libVkLayer_MESA_anti_lag.so'},
+  input : 'VkLayer_MESA_anti_lag.json.in',
+  output : '@BASENAME@',
+  install : true,
   install_dir : join_paths(get_option('datadir'), 'vulkan', 'implicit_layer.d'),
   install_tag : 'runtime',
 )
+
+configure_file(
+  configuration : {'library_path' : vklayer_mesa_anti_lag.full_path()},
+  input : 'VkLayer_MESA_anti_lag.json.in',
+  output : '@PLAINNAME@_dev.json',
+)
+devenv.append('VK_ADD_IMPLICIT_LAYER_PATH', meson.current_build_dir())