Issue #11361: building fails on macOS.

This line should have never been pushed (in commit a78c41d2a3), my bad! It was
an early (extremely ugly and bad!) attempt to try and have the bindings see the
libraries another way than using DYLD_LIBRARY_PATH (which was instead resolved
with commit 3e980d5ad4).

This omission went unnoticed until I add `set -e` very likely as this failed
command would stop the script in failure.

meson.build

@@ -1908,7 +1908,6 @@ if meson.can_run_host_binaries()
     foreach plugin_exe : plugin_executables
       gimp_run_env.prepend('GIMP_TEMP_UPDATE_RPATH', plugin_exe)
     endforeach
-    gimp_run_env.prepend('GIMP_TEMP_UPDATE_RPATH', gi.get_variable('libdir') / 'libgirepository-1.0.dylib')
   endif
 else
   # Cross-builds require an existing native GIMP installed, unless we