Don’t disallow javadoc generation in subprojects.

Even though these aren’t used in Glide’s javadoc, they are used in 
creating the javadoc jars uploaded to maven.

Fixes #1972.

build.gradle

@@ -67,11 +67,6 @@ subprojects { project ->
             options.compilerArgs << '-Xlint:unchecked' << '-Xlint:deprecation'
         }
     }
-
-    // We generate a combined javadoc, no need to create javadocs for each library independently.
-    if (!project.name.equals('glide')) {
-        tasks.withType(Javadoc).all { enabled = false }
-    }
 }
 
 task wrapper(type: Wrapper) {