add readline dependency `type`

packages/nest/package.py

@@ -101,9 +101,9 @@ class Nest(CMakePackage):
     depends_on('py-mpi4py',         when='+python+mpi', type=('run', 'test'))
     depends_on('doxygen',           type='build')
     depends_on('gsl',               when='+gsl')
-    depends_on('readline')
-    depends_on('ncurses')
-    depends_on('libtool')
+    depends_on('readline',          type=('build', 'run', 'test'))
+    depends_on('ncurses',          type=('build', 'run', 'test'))
+    depends_on('libtool',          type=('build', 'run', 'test'))
     depends_on('pkgconfig',         type='build')
 
     extends('python', when='+python')