Add libmagic location to Python rpath

This enables ctypes to find the slapos libmagic, instead of the system one

component/python-2.6/buildout.cfg

@@ -10,6 +10,7 @@ extends =
   ../readline/buildout.cfg
   ../sqlite3/buildout.cfg
   ../zlib/buildout.cfg
+  ../file/buildout.cfg
 
 parts =
     python2.6
@@ -45,9 +46,11 @@ configure-options =
   --enable-unicode=ucs4
   --with-threads
 
+# the entry "-Wl,-rpath=${file:location}/lib" below is needed by python-magic,
+# which would otherwise load the system libmagic.so with ctypes
 environment =
   CPPFLAGS=-I${zlib:location}/include -I${readline:location}/include -I${ncurses:location}/include/ -I${ncurses:location}/include/ncursesw/ -I${bzip2:location}/include  -I${gdbm:location}/include -I${openssl:location}/include -I${sqlite3:location}/include -I${gettext:location}/include
-  LDFLAGS=-L${zlib:location}/lib -L${readline:location}/lib -L${ncurses:location}/lib -L${bzip2:location}/lib -L${gdbm:location}/lib -L${openssl:location}/lib -L${sqlite3:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${readline:location}/lib -Wl,-rpath=${ncurses:location}/lib -Wl,-rpath=${bzip2:location}/lib -Wl,-rpath=${gdbm:location}/lib -Wl,-rpath=${openssl:location}/lib -Wl,-rpath=${sqlite3:location}/lib -L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib
+  LDFLAGS=-L${zlib:location}/lib -L${readline:location}/lib -L${ncurses:location}/lib -L${bzip2:location}/lib -L${gdbm:location}/lib -L${openssl:location}/lib -L${sqlite3:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${readline:location}/lib -Wl,-rpath=${ncurses:location}/lib -Wl,-rpath=${bzip2:location}/lib -Wl,-rpath=${gdbm:location}/lib -Wl,-rpath=${openssl:location}/lib -Wl,-rpath=${sqlite3:location}/lib -L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib -Wl,-rpath=${file:location}/lib
 
 [bootstrap2.6]
 recipe = zc.recipe.egg

component/python-2.7/buildout.cfg

@@ -9,6 +9,7 @@ extends =
   ../readline/buildout.cfg
   ../sqlite3/buildout.cfg
   ../zlib/buildout.cfg
+  ../file/buildout.cfg
 
 parts =
     python2.7
@@ -44,6 +45,8 @@ configure-options =
   --with-system-expat
   --with-threads
 
+# the entry "-Wl,-rpath=${file:location}/lib" below is needed by python-magic,
+# which would otherwise load the system libmagic.so with ctypes
 environment =
   CPPFLAGS=-I${zlib:location}/include -I${readline:location}/include -I${libexpat:location}/include -I${ncurses:location}/include -I${ncurses:location}/include/ncursesw -I${bzip2:location}/include  -I${gdbm:location}/include -I${openssl:location}/include -I${sqlite3:location}/include -I${gettext:location}/include
-  LDFLAGS=-L${zlib:location}/lib -L${readline:location}/lib -L${libexpat:location}/lib -L${ncurses:location}/lib -L${bzip2:location}/lib -L${gdbm:location}/lib -L${openssl:location}/lib -L${sqlite3:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${readline:location}/lib -Wl,-rpath=${libexpat:location}/lib -Wl,-rpath=${ncurses:location}/lib -Wl,-rpath=${bzip2:location}/lib -Wl,-rpath=${gdbm:location}/lib -Wl,-rpath=${openssl:location}/lib -Wl,-rpath=${sqlite3:location}/lib -L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib
+  LDFLAGS=-L${zlib:location}/lib -L${readline:location}/lib -L${libexpat:location}/lib -L${ncurses:location}/lib -L${bzip2:location}/lib -L${gdbm:location}/lib -L${openssl:location}/lib -L${sqlite3:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${readline:location}/lib -Wl,-rpath=${libexpat:location}/lib -Wl,-rpath=${ncurses:location}/lib -Wl,-rpath=${bzip2:location}/lib -Wl,-rpath=${gdbm:location}/lib -Wl,-rpath=${openssl:location}/lib -Wl,-rpath=${sqlite3:location}/lib -L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib -Wl,-rpath=${file:location}/lib