Update folks to 0.9.7.

Fix the build with clang. Define folks_persona_store_set_is_user_set_default in
backends/eds/lib/edsf-persona-store.c like it's done in folks/persona-store.c.

Also remove patch-tests_lib_test-case-helper.c, which is unneeded (committed
upstream)


git-svn-id: svn://creme-brulee.marcuscom.com/ports/trunk@19746 df743ca5-7f9a-e211-a948-0013205c9059