plugins/elements/: Remove GstBufferStore, no idea why we were still building it.

plugins/elements/: Remove GstBufferStore, no idea why we were still building it.

Original commit message from CVS:
* plugins/elements/Makefile.am:
* plugins/elements/gstbufferstore.c:
* plugins/elements/gstbufferstore.h:
* plugins/elements/gsttypefindelement.h:
Remove GstBufferStore, no idea why we were still building it.
It's not used anywhere and superseded by GstAdapter.
* plugins/elements/gstfilesrc.c: (gst_file_src_map_region),
(gst_file_src_create_mmap):
* plugins/indexers/gstfileindex.c: (gst_file_index_add_association):
Printf format fixes for 64-bit integers.