This will be an alternative way to fix#14236, without needing to have
every usage depend on another (which is messy and bug-prone because then
we have to follow the list of dependencies and see which was the last
use of gimp_exe, and with the risk of errors depending on which build
options are ON or OFF).
This fixes such errors:
> error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool:
> for: /Users/Shared/work/GNOME/gimp/_build-x86_64/plug-ins/common/test-plug-ins/film/film (for architecture x86_64)
> option "-add_rpath /Users/Shared/work/GNOME/gimp/_build-x86_64/libgimpcolor" would duplicate path, file already
> has LC_RPATH for: /Users/Shared/work/GNOME/gimp/_build-x86_64/libgimpcolor
a7e39c16b1