PERL_RELOCATABLE_INCPUSH was added in commit
f31c6eed22759301. As it
causes a small specific behaviour change that isn't visible in any other
configuration option, it seems useful to indicate that the perl binary has
been compiled with it, to aid debugging. (Specifically, debugging of "Why
isn't this working?" when it failed to be enabled.)
# ifdef PERL_PRESERVE_IVUV
" PERL_PRESERVE_IVUV"
# endif
+# ifdef PERL_RELOCATABLE_INCPUSH
+ " PERL_RELOCATABLE_INCPUSH"
+# endif
# ifdef PERL_USE_DEVEL
" PERL_USE_DEVEL"
# endif