ext/cdio/Makefile.am: Add GST_BASE_CFLAGS and GST_BASE_LIBS (seems to be required for Cygwin, see #317048)

Original commit message from CVS:
* ext/cdio/Makefile.am:
Add GST_BASE_CFLAGS and GST_BASE_LIBS (seems to be
required for Cygwin, see #317048)
* gst/rtp/gstasteriskh263.c:
Cygwin has includes for both the unix network socket API
and the windows API, but only one can be included, so fix
includes to only use one or the other, prefering the unxi
one (#317048).