avfilter/transpose_vt: fix build on xcode 16

[gnattu]

Xcode 16 marks VTPixelRotationSessionRef as macOS 13+ only type as well. As it is technically only a pointer, use type void* in the struct and cast to VTPixelRotationSessionRef when using.

Changes

Issues

[nyanmisaka]

The submodule gnulib of libiconv fails due to coreutils/gnulib@d340654.

2024-09-26T10:41:40.9630047Z #9 125.5 checking whether to activate relocatable installation... no
2024-09-26T10:41:40.9631143Z #9 125.5 ./configure: line 13015: syntax error near unexpected token `reloc_final_prefix'
2024-09-26T10:41:40.9632263Z #9 125.5 ./configure: line 13015: `    gl_BUILD_TO_HOST(reloc_final_prefix)'
2024-09-26T10:41:40.9633197Z #9 125.5 configure: error: ./configure failed for libcharset
2024-09-26T10:41:41.1474850Z #9 ERROR: process "/bin/sh -c run_stage /stage.sh" did not complete successfully: exit code: 2

jellyfin-ffmpeg/builder/scripts.d/20-libiconv.sh

Line 20 in 2fad34d

url = https://github.com/coreutils/gnulib.git