Add hook for Unicode private use override

I am starting to write a Unicode::Private_Use module which will allow
one to specify the Unicode properties of private use code points, thus
making them actually useful.  This commit adds a hook to regcomp.c to
accommodate this module.  The changes are pretty minimal.  This way we
don't have to wait another release cycle to get it out there.

I don't want to document this interface, until it's proven.

1 files changed, 2 insertions, 0 deletions

diff --git a/perlapi.h b/perlapi.h
index 66f5ac5f73..4cfbafecdf 100644
--- a/perlapi.h
+++ b/perlapi.h
@@ -123,6 +123,8 @@ END_EXTERN_C
 #define PL_NonFinalFold		(*Perl_GNonFinalFold_ptr(NULL))
 #undef  PL_Posix_ptrs
 #define PL_Posix_ptrs		(*Perl_GPosix_ptrs_ptr(NULL))
+#undef  PL_Private_Use
+#define PL_Private_Use		(*Perl_GPrivate_Use_ptr(NULL))
 #undef  PL_SB_invlist
 #define PL_SB_invlist		(*Perl_GSB_invlist_ptr(NULL))
 #undef  PL_SCX_invlist