Ensure RAJA builds out-of-source

var/spack/repos/builtin/packages/raja/package.py

@@ -32,6 +32,7 @@ class Raja(Package):
     version('git', git='https://github.com/LLNL/RAJA.git', branch="master")
 
     def install(self, spec, prefix):
-        cmake('.', *std_cmake_args)
+        with working_dir('build', create=True):
+            cmake('..', *std_cmake_args)
             make()
             make('install')