Add GPL'ized versions of non-free components

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@47080 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e

common/build.gradle

@@ -32,18 +32,24 @@ dependencies {
 }
 
 sourceSets {
-	main {
-    	    java {
-        	srcDir compileJavacc.outputDirectory
-        	srcDir compileJavacc.inputDirectory
-    	    }
-	    resources {
-		// consider changing it to src/gpl/resources to exclude non-free components:
-		srcDir 'src/nonfree/resources' 
-	    }
-	}
+    nonfree
+    gpl
+    main {
+        java {
+            srcDir compileJavacc.outputDirectory
+            srcDir compileJavacc.inputDirectory
+        }
+        resources {
+            if (project.hasProperty("usegpl")) {
+                srcDirs += gpl.resources.srcDirs
+            } else {
+                srcDirs += nonfree.resources.srcDirs
+            }
+        }
+    }
 }
 
+
 compileJavacc {
 	arguments = [static: 'false']
 }