libheif's examples do not run in macOS Sonoma

[johnsonea]

Running libheif's examples in macOS Sonoma 14.2.1 (have not checked earlier macOS versions) gives an error:

% /usr/local/bin/heif-info /System/Library/Desktop\ Pictures/Sonoma.heic
dyld[92961]: Library not loaded: @rpath/libheif.1.dylib
  Referenced from: <B7A8B87B-46A4-3205-A732-A4F618AFB2F7> /usr/local/bin/heif-info
  Reason: no LC_RPATH's found
zsh: abort      /usr/local/bin/heif-info /System/Library/Desktop\ Pictures/Sonoma.heic

Inserting the following at the top of examples/CMakeLists.txt fixes the problem

set(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})

which translates to /usr/local/lib. (Perhaps the line above should be wrapped between if (APPLE) and endif () lines?)

(I admittedly know almost nothing about CMake, so it's not clear if this is the best, most efficient, or most CMake-ish way of fixing this bug. BTW, setting the DYLD_LIBRARY_PATH environment variable to /usr/local/lib also fixes the problem, but CMake already knows where it is installing the library, so there's no reason to not set rpath appropriately.)