[Cin] more patches for building on my slackware

[Phyllis Smith]

Checked into GIT the 4 Slackware patches.  Just compiled on Fedora 32,
Ubuntu 16, and Debian 11.0 32-bit just to ensure that all of the last few
days of Megapile patches that were checked in caused no problems.

The updated cin.SlackBuild included OpenCV build which does not have much
usage and takes a long time to download and to compile so do not want to
have that in as a default.  However, what does line 27 "BUILD=${BUILD:-2}"
versus the original setting of 1 instead of 2 represent?  Is this a change
that is required? and should be checked into GIT? or does it work just fine
as a 1?

right now I use those patches and Slackbuild for compiling on my x86
> slackware...
>
> change from J to X was inspired by libdv patch doing reverse of this for
> gcc 4.1:
>
Not sure if this is "inspiration" or "cause for future crashes" or even
"better because prevents crashes"?  But I like the concept of "anything
goes" with an "X"!

>
> https://sourceforge.net/p/libdv/mailman/message/2320559/
>
> I also tried 'n' but build was failing too  ..
>
> some description for those constraints:
>
> https://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html#s6
>
> On Saturday, April 16, 2022, Andrew Randrianasulu <randrianasulu at gmail.com>
> wrote:
>
>> hold on, I am not sure what going on - I tried again with slightly
>> modified cin.Slackbuild and build was failing again until I replaced 'i'
>> with 'X' (anything goes here asm constrain).
>>
>> it seems to work afterwards - mpeg 2 / 4:2:2 encoding working at 7.5 fps
>> for fullhd vid.. but I want to double-check (uname -m must return i686 for
>> this code to even compile...)
>>
>> On Friday, April 15, 2022, Andrew Randrianasulu <randrianasulu at gmail.com>
>> wrote:
>>
>>> sorry, there was 4th patch
>>>
>>> On Friday, April 15, 2022, Andrew Randrianasulu <randrianasulu at gmail.com>
>>> wrote:
>>>
>>>> due to X libs/headers located in /usr/X11R7...
>>>>
>>>> but also due to some asm error in mpeg2enc when I build for i686
>>>> target...
>>>>
>>>>
>>>> http://forum.tinycorelinux.net/index.php/topic,18142.0.html?PHPSESSID=cd4712cf278ad777dc1c3a2356e0bf9d
>>>>
>>>>
>>>>
>>>> I added -fomit-frame-pointer to only mpeg2enc cflags and it compiled...
>>>> not sure why I was not hit by this earlier, may be because I already had
>>>> this in cflags?
>>>>
>>>>
>>>> --
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