[Cin] Enable Cingg single-user build to use system libSvtAv1Enc upgraded to v. 2.3.0

[Terje J. Hanssen]

I upgraded my system Slowroll to

S  | Name                | Type    | Version                        | 
Arch   | Repository
---+---------------------+---------+--------------------------------+--------+----------------------
i+ | libSvtAv1Enc2       | package | 2.3.0-1.5                      | 
x86_64 | obs:multimedia:libs
i+ | SVT-AV1             | package | 2.3.0-1.5                      | 
x86_64 | obs:multimedia:libs

Version test:

    # SvtAv1EncApp
    Svt[info]: -------------------------------------------
    Svt[info]: SVT [version]:    SVT-AV1 Encoder Lib v2.3.0
    Svt[info]: SVT [build]  :    GCC 14.2.1 20241007 [revision
    4af44f2cf7d281f3e4f3957efce10e8b2ccb2ad3]     64 bit
    Svt[info]: LIB Build date: Oct 29 2024 22:11:44
    Svt[info]: -------------------------------------------


File list for

    rpm -ql libSvtAv1Enc2
    /usr/lib64/libSvtAv1Enc.so.2
    /usr/lib64/libSvtAv1Enc.so.2.3.0
    /usr/share/licenses/libSvtAv1Enc2
    /usr/share/licenses/libSvtAv1Enc2/LICENSE.md
    /usr/share/licenses/libSvtAv1Enc2/PATENTS.md

I tested first that SVT-AV1 v. 2.3.0 encoding worked OK with my existing 
system ffmpeg v. 7.1

I'm not sure I ever have tested av1_svt rendering with my single-user 
build Cingg before now.
But when I tried now to render the same hdv file as with ffmpeg, Cingg 
failed with

    int FFMPEG::open_encoder(const char*, const char*):
    cant find codec libsvtav1:/Videoklipp/AV1/hdv09_04_m2t_svt-av1_230.webm


Shouldn't Cingg be able to work with the system upgraded libSvtAv1Enc2 
v. 2-3-0 automatically as well as ffmpeg does?
Or if necessary  via a simple "update", without complete rebuild?
-------------

I had a look at my last rebuild of Cingg for using ffmpeg 7.1 :
Does "disabled  libsvtav1" say something?

# ./configure --with-single-user --disable-static-build 
--without-thirdparty --without-libdpx
configure: loading site script /usr/share/site/x86_64-pc-linux-gnu
..........snip
checking for /usr/local/cuda/include/cuda.h... no
checking cuda sdk... no
checking for dlopen in -ldl... yes
checking for numa_alloc in -lnuma... yes
checking for openexr available... yes
   Reason                  Package
   ------                  -------
   disabled                encore
   disabled                audiofile
   disabled                esound
   disabled                libsvtav1
...snip...







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