Fix build of packman

HEAD now exports HeapAlloc.h

patches/packman-0.5.0.patch

+diff --git a/cbits/GhcHeapAlloc.h b/cbits/GhcHeapAlloc.h
+index 0ec1e6d..65b9f43 100644
+--- a/cbits/GhcHeapAlloc.h
++++ b/cbits/GhcHeapAlloc.h
+@@ -51,11 +51,13 @@
+ 
+ #ifdef USE_LARGE_ADDRESS_SPACE
+ 
++#ifndef HEAP_ALLOC_PUBLIC
+ struct mblock_address_range {
+     W_ begin, end;
+     W_ padding[6];  // ensure nothing else inhabits this cache line
+ } ATTRIBUTE_ALIGNED(64);
+ extern struct mblock_address_range mblock_address_space;
++#endif
+ 
+ # define HEAP_ALLOCED(p)        ((W_)(p) >= mblock_address_space.begin && \
+                                  (W_)(p) < (mblock_address_space.end))
 diff --git a/cbits/Pack.c b/cbits/Pack.c
 index 2c73161..27007c2 100644
 --- a/cbits/Pack.c
@@ -71,3 +89,16 @@ index 2c73161..27007c2 100644
                          = get_fun_itbl(UNTAG_CLOSURE(p));
                      strcat(fp, "|");
                      switch (funInfo->f.fun_type) {
+diff --git a/packman.cabal b/packman.cabal
+index 04bd6bd..fc52685 100644
+--- a/packman.cabal
++++ b/packman.cabal
+@@ -88,6 +88,8 @@ library
+     cc-options:      -g -DDEBUG -DLIBRARY_CODE
+   else
+     cc-options:      -DLIBRARY_CODE
++  if impl(ghc > 9.11.0)
++    cc-options: -DHEAP_ALLOC_PUBLIC
+ 
+ test-suite simpletest
+   type:              exitcode-stdio-1.0