Support augment_platform in JLLWrappers

Author: vchuravy

src/toplevel_generators.jl

@@ -31,13 +31,19 @@ function generate_imports(src_name)
             using Pkg.Artifacts: load_artifacts_toml, unpack_platform
             using Pkg.BinaryPlatforms: triplet, select_platform
             HostPlatform() = platform_key_abi()
+            if !@isdefined(augment_platform)
+                augment_platform(platform) = platform
+            end
         end
     else
         # Use fast stdlib-based Artifacts + Preferences
         return quote
             using Libdl, Artifacts, JLLWrappers.Preferences, Base.BinaryPlatforms
             using Artifacts: load_artifacts_toml, unpack_platform
             using Base.BinaryPlatforms: triplet, select_platform
+            if !@isdefined(augment_platform)
+                augment_platform(platform) = platform
+            end
         end
     end
 end
@@ -158,13 +164,15 @@ function generate_wrapper_load(src_name, pkg_uuid, __source__)
                 end
 
                 # From the available options, choose the best wrapper script
-                select_platform(valid_wrappers)
+                platform = augment_platform(HostPlatform())
+                select_platform(valid_wrappers, platform)
             end
         end
 
         # Load in the wrapper, if it's not `nothing`!
         if best_wrapper === nothing
-            @debug(string("Unable to load ", $(src_name), "; unsupported platform ", triplet(HostPlatform())))
+            platform = augment_platform(HostPlatform())
+            @debug(string("Unable to load ", $(src_name), "; unsupported platform ", repr(platform)))
             is_available() = false
         else
             Base.include($(Symbol("$(src_name)_jll")), best_wrapper)