[libheif] Fix error when libgdk-pixbuf2.0-dev installed in linux

[Cheney-W]

Fixes #29156

gdk-pixbuf is a dependency of libheif. When libgdk-pixbuf2.0-dev installed in linux, the installation of libheif:x64-linux fails due to the following error:

CMake Error at gdk-pixbuf/cmake_install.cmake:60 (file):
  file INSTALL cannot copy file
  "/home/xxx/vcpkg/buildtrees/libheif/x64-linux-dbg/gdk-pixbuf/libpixbufloader-heif.so"
  to
  "/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-heif.so":
  Success.

This is because pkg_check_modules finds the system-installed gdk-pixbuf instead of the one installed by vcpkg.

To fix this issue, I added a patch to make pkg_check_modules only look for gdk-pixbuf provided by vcpkg.

• Changes comply with the maintainer guide
• SHA512s are updated for each updated download
• The "supports" clause reflects platforms that may be fixed by this new version
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

[BillyONeal]

Thanks!