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Remove the Icwd Makefile macros as lib/buildcustomize.pl now sets this up.
Now that lib/buildcustomize.pl is built at the same time as building
miniperl, it will always have added paths to Cwd into @INC. Hence there's no
longer a need for Makefile macros to do this.
On Win32 we can't eliminate $(ICWD) completely as it's also being used for some
invocations of the (real) perl binary. Only miniperl loads buildcustomize.pl
to set up @INC to include paths for the initial locations of modules such
as Cwd.