Fix log4cxx dependencies (#7570)

* Add ignore_conflicts to package activation

includes:
* with_dependency flag for do_activate
* ignore_conflicts flag for do_activate
* start of cleanup of activate cmd

* ensure that apr is picked up

* Update package.py

* add apr explicitly as dependency

* remove unnecessary newlines

* Update package.py

fixing dependencies

var/spack/repos/builtin/packages/log4cxx/package.py

@@ -33,8 +33,9 @@ class Log4cxx(AutotoolsPackage):
 
     version('0.10.0', 'b30ffb8da3665178e68940ff7a61084c')
 
-    depends_on('libxml2')
     depends_on('apr-util')
+    depends_on('apr')
+    depends_on('zip')
 
     build_directory = 'spack-build'
 
@@ -43,8 +44,6 @@ class Log4cxx(AutotoolsPackage):
     patch('log4cxx-0.10.0-narrowing-fixes-from-upstream.patch')
 
     def configure_args(self):
-        args = ['--disable-static',
-                # 'apr''s 'bin' isn't pulled (via apr-util) into build env
-                '--with-apr={0}'.format(self.spec['apr'].prefix)]
+        args = ['--disable-static']
 
         return args