Build: Fix detection of Eclipse Compiler Server (#31838)

It looks like Eclipse's compiler server recently changed something so
our "eclipse detector" stopped working for it. I've updated the detector
so it ought to work now.

Author: nik9000

build.gradle

@@ -113,7 +113,10 @@ Map<String, String> buildMetadataMap = buildMetadataValue.tokenize(';').collectE
 allprojects {
   project.ext {
     // for ide hacks...
-    isEclipse = System.getProperty("eclipse.launcher") != null || gradle.startParameter.taskNames.contains('eclipse') || gradle.startParameter.taskNames.contains('cleanEclipse')
+    isEclipse = System.getProperty("eclipse.launcher") != null ||   // Detects gradle launched from Eclipse's IDE
+            System.getProperty("eclipse.application") != null ||    // Detects gradle launched from the Eclipse compiler server
+            gradle.startParameter.taskNames.contains('eclipse') ||  // Detects gradle launched from the command line to do eclipse stuff
+            gradle.startParameter.taskNames.contains('cleanEclipse')
     isIdea = System.getProperty("idea.active") != null || gradle.startParameter.taskNames.contains('idea') || gradle.startParameter.taskNames.contains('cleanIdea')
 
     // for BWC testing