meson: make in-build-gimp.sh idempotent

This does not fix the underlying bug, just means it doesn't fail on `install_name_tool`.

An aspect of a fix for https://gitlab.gnome.org/GNOME/gimp/-/issues/12644

tools/in-build-gimp.sh

@@ -10,17 +10,12 @@ if [ -n "$GIMP_TEMP_UPDATE_RPATH" ]; then
   # it didn't work on contributor's builds because of System Integrity
   # Protection (SIP), though it did work in the CI.
   export IFS=":"
-  for bin in $GIMP_TEMP_UPDATE_RPATH;
-  do
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimp $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpbase $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpcolor $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpconfig $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpmath $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpmodule $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpthumb $bin
-    install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpwidgets $bin
-  done;
+  for bin in $GIMP_TEMP_UPDATE_RPATH; do
+    for lib in libgimp libgimpbase libgimpcolor libgimpconfig libgimpmath libgimpmodule libgimpthumb libgimpwidgets; do
+      install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/$lib $bin || true
+      install_name_tool -add_rpath ${GIMP_GLOBAL_BUILD_ROOT}/$lib $bin
+    done
+  done
   unset IFS
 fi
 
@@ -28,17 +23,11 @@ cat /dev/stdin | $GIMP_SELF_IN_BUILD "$@"
 
 if [ -n "$GIMP_TEMP_UPDATE_RPATH" ]; then
   export IFS=":"
-  for bin in $GIMP_TEMP_UPDATE_RPATH;
-  do
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimp $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpbase $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpcolor $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpconfig $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpmath $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpmodule $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpthumb $bin
-    install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/libgimpwidgets $bin
-  done;
+  for bin in $GIMP_TEMP_UPDATE_RPATH; do
+    for lib in libgimp libgimpbase libgimpcolor libgimpconfig libgimpmath libgimpmodule libgimpthumb libgimpwidgets; do
+      install_name_tool -delete_rpath ${GIMP_GLOBAL_BUILD_ROOT}/$lib $bin
+    done
+  done
   unset IFS
 fi