[mythtv] [patch] automagic settings.pro (version 4)

[Nigel Pearson]

1) The CFLAGS, which may have been customised for Darwin or
    with --tune, are overwritten with $PCFLAGS on line 777


2) Quite a few lines in settings.pro are like:

using_firewire {
     DEFINES += USING_FIREWIRE

    It would probably be safe for configure to set defines
for any using_ variable. Some of them do not currently
have corresponding -DUSING_ values (e.g. using_lirc),
but extra defines should not matter?

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