[PATCH 5.5.64] Better localization for %^H

The current scheme of localization of %^H works in simplest cases, but
it should break in harder ones.  I'm not ready to produce a test case,
but the following patch should fix it.  AFACU, it would not create any
memory leak too.

Enjoy,
Ilya

P.S.  I do not know what clone_interpreter is doing, so I cannot
comment on whether what it is doing with %^H is "correct".

--- ./pp_ctl.c~	Tue Feb  1 15:29:47 2000
+++ ./pp_ctl.c	Mon Feb 21 17:15:35 2000
@@ -3108,6 +3108,7 @@ PP(pp_require)
     PL_rsfp = tryrsfp;
     SAVEHINTS();
     PL_hints = 0;
+    GvHV(PL_hintgv) = NULL;
     SAVESPTR(PL_compiling.cop_warnings);
     if (PL_dowarn & G_WARN_ALL_ON)
         PL_compiling.cop_warnings = WARN_ALL ;

• [PATCH 5.5.64] Better localization for %^H by Ilya Zakharevich