gst/gst.c: Make _gst_disable_segtrap static, it's only used in gstplugin.c and we...

gst/gst.c: Make  _gst_disable_segtrap static, it's only used in gstplugin.c and we can use gst_segtrap_is_enabled() t...

Original commit message from CVS:
* gst/gst.c: (_gst_disable_segtrap):
Make  _gst_disable_segtrap static, it's only used in gstplugin.c and
we can use gst_segtrap_is_enabled() there now that we have that API.
Move _gst_debug_dump_dot_dir into gstdebugutils.c, there's no reason
to do the getenv here (and export the variable).
* gst/gstdebugutils.c: (debug_dump_element),
(_gst_debug_bin_to_dot_file), (_gst_debug_bin_to_dot_file_with_ts):
Don't use VLAs which is a C99ism and throws off MSVC (#493983).
* gst/gstinfo.c: (_priv_gst_info_start_time), (_gst_debug_init),
(gst_debug_log_default):
Rename _gst_info_start_time to priv_gst_info_start_time so it
doesn't get exported (was never in any header).
* gst/gstplugin.c: (_gst_plugin_fault_handler_setup),
(gst_plugin_loading_mutex):
Make static mutex gst_plugin_loading_mutex really static (was never
in any header), and use gst_segtrap_is_enabled() instead of
_gst_disable_segtrap.
* gst/gsttrace.c: (_gst_trace_default):
Make local _gst_trace_default static (was never in any header).