gst/: Bunch of gratuitous nano-optimisations.

gst/: Bunch of gratuitous nano-optimisations.

Original commit message from CVS:
* gst/gstcaps.c: (gst_caps_to_string):
* gst/gstinfo.c: (gst_debug_construct_term_color):
* gst/gstparse.c: (gst_parse_launchv):
* gst/gstutils.c: (gst_util_dump_mem):
* gst/gstvalue.c: (gst_value_serialize_any_list),
(gst_value_transform_any_list_string):
Bunch of gratuitous nano-optimisations.