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Introduce macros to simplify @INC setting
Distro trends to customize @INC, and to maintain
patches to change the order of @INC or add custom entries.
The goal of this patch is to abstract calls to 'S_incpush_use_sep'
and simplify reordering @INC.
This commit makes the code from perl.c more comfortable to read
by introducing several 'INCPUSH_*' macros for every
'S_incpush_use_sep' call so we can easily reorder them.