ExternalProject: Fix regression in stamp creation for Xcode+iOS
The change to _ep_add_mkdir_command
in !6888 (merged) did not account for the possibility that
CMAKE_CFG_INTDIR
is $(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)
instead of just the configuration name. Pass the value into the helper
script on the command line so that the native buildsystem placeholders
are evaluated.
Fixes: #23645 (closed)
Backport: release