fix: forcibly retrieve lwjgl from libraries.minecraft.net

Mojang has a patched version that is not on Central.
This change does not apply to users who do not inject repositories.

subprojects/gradle-plugin/src/main/java/org/spongepowered/gradle/vanilla/internal/Constants.java

@@ -25,6 +25,7 @@
 package org.spongepowered.gradle.vanilla.internal;
 
 import org.gradle.api.artifacts.dsl.RepositoryHandler;
+import org.gradle.api.artifacts.repositories.MavenArtifactRepository;
 import org.gradle.api.artifacts.repositories.MavenRepositoryContentDescriptor;
 import org.gradle.util.GradleVersion;
 import org.objectweb.asm.Opcodes;
@@ -121,11 +122,19 @@ private Repositories() {
         }
 
         public static void applyTo(final RepositoryHandler repositories) {
-            repositories.maven(repo -> {
+            final MavenArtifactRepository mojang = repositories.maven(repo -> {
                 repo.setUrl(Constants.Repositories.MINECRAFT);
                 repo.mavenContent(MavenRepositoryContentDescriptor::releasesOnly);
+                repo.metadataSources(MavenArtifactRepository.MetadataSources::mavenPom); // mojang's repo doesn't include GMM
                 repo.setName("minecraft");
             });
+            repositories.exclusiveContent(exc -> {
+                exc.forRepositories(mojang)
+                    .filter(conf -> {
+                        conf.includeGroupAndSubgroups("org.lwjgl");
+                        conf.includeGroupAndSubgroups("com.mojang");
+                    });
+            });
             repositories.maven(repo -> {
                 repo.setUrl(Constants.Repositories.MINECRAFT_FORGE);
                 repo.setName("forge");