python-magic : do not fail to import the lib

ctypes lib does not read the rpath of the current binary to look after the
desired library, so although it exits the import failed. Pass-by the first
find to make the import work

component/egg-patch/python_magic/magic.patch

+--- python-magic-0.4.10/magic.py.orig	2016-01-14 23:41:31.867145173 +0100
++++ python-magic-0.4.10/magic.py	2016-01-14 23:41:54.563401069 +0100
+@@ -143,7 +143,7 @@
+ 
+ libmagic = None
+ # Let's try to find magic or magic1
+-dll = ctypes.util.find_library('magic') or ctypes.util.find_library('magic1') or ctypes.util.find_library('cygmagic-1')
++dll = ctypes.util.find_library('magic') or ctypes.util.find_library('magic1') or ctypes.util.find_library('cygmagic-1') or 'libmagic.so'
+ 
+ # This is necessary because find_library returns None if it doesn't find the library
+ if dll:

stack/erp5/buildout.cfg

@@ -567,6 +567,8 @@ Acquisition-patches = ${:_profile_base_location_}/../../component/egg-patch/Acqu
 Acquisition-patch-options = -p1
 Products.DCWorkflow-patches = ${:_profile_base_location_}/../../component/egg-patch/Products.DCWorkflow/workflow_method.patch
 Products.DCWorkflow-patch-options = -p1
+python-magic-patches = ${:_profile_base_location_}/../../component/egg-patch/python_magic/magic.patch
+python-magic-patch-options = -p1
 
 [zodbanalyze]
 recipe = zc.recipe.egg
@@ -602,6 +604,7 @@ Acquisition = 2.13.8+SlapOSPatched001
 Products.DCWorkflow = 2.2.4+SlapOSPatched001
 pysvn = 1.7.10+SlapOSPatched002
 python-ldap = 2.4.22+SlapOSPatched001
+python-magic = 0.4.10+SlapOSPatched001
 
 # specify dev version to be sure that an old released version is not used
 cloudooo = 1.2.5-dev
@@ -683,7 +686,6 @@ pycountry = 1.19
 pyflakes = 1.0.0
 # pylint 1.5.1 breaks testDynamicClassGeneration
 pylint = 1.4.4
-python-magic = 0.4.10
 python-memcached = 1.57
 pytracemalloc = 1.2
 qrcode = 5.1