Making Coq compile with ocp-memprof.

Patch provided by Çagdas Bozman.

kernel/byterun/coq_gc.h

@@ -12,6 +12,7 @@
 #define _COQ_CAML_GC_
 #include <caml/mlvalues.h>
 #include <caml/alloc.h>
+#include <caml/memory.h>
 
 typedef void (*scanning_action) (value, value *);
 
@@ -24,12 +25,22 @@ CAMLextern void minor_collection (void);
 #define Caml_white (0 << 8)
 #define Caml_black (3 << 8)
 
+#ifdef HAS_OCP_MEMPROF
+
+/*  This code is necessary to make the OCamlPro memory profiling branch of
+    OCaml compile. */
+
+#define Make_header(wosize, tag, color)                                 \
+  caml_make_header(wosize, tag, color)
+
+#else
+
 #define Make_header(wosize, tag, color)                                 \
   (((header_t) (((header_t) (wosize) << 10)                             \
 		+ (color)                                               \
 		+ (tag_t) (tag)))   					\
    )
-
+#endif
 
 #define Alloc_small(result, wosize, tag) do{                            \
   young_ptr -= Bhsize_wosize (wosize);                                  \