samples: Use built from sources gradle plugin by default.

build.gradle

@@ -370,15 +370,10 @@ task bundle(type: Tar) {
         include 'RELEASE_NOTES.md'
         include 'GRADLE_PLUGIN.md'
         exclude '**/gradle.properties'
+        exclude '**/settings.gradle'
         exclude '**/build'
         exclude '**/.gradle'
-        rename { String fileName ->
-            if (fileName == "gradle.properties.for_bundle") {
-                return "gradle.properties"
-            } else {
-                return fileName
-            }
-        }
+        rename('(.*)\\.for_bundle', '$1')
         into baseName
     }
     destinationDir = file('.')

samples/settings.gradle

@@ -6,3 +6,5 @@ include ':nonBlockingEchoServer'
 include ':opengl'
 include ':socket'
 include ':tetris'
+
+includeBuild '../'

samples/settings.gradle.for_bundle

@@ -0,0 +1,8 @@
+include ':csvparser'
+include ':gitchurn'
+include ':gtk'
+include ':libcurl'
+include ':nonBlockingEchoServer'
+include ':opengl'
+include ':socket'
+include ':tetris'