Remove const from __*_hook variable declarations.

Remove const from __*_hook variable declarations, so that glibc can
modify them during process forking.

ChangeLog

@@ -18,6 +18,8 @@ found in the git revision history:
 
   Bug fixes:
   - Fix heap profiling crash if sampled object is freed via realloc(p, 0).
+  - Remove const from __*_hook variable declarations, so that glibc can modify
+    them during process forking.
 
 * 3.0.0 (May 11, 2012)
 

src/jemalloc.c

@@ -1265,11 +1265,10 @@ je_valloc(size_t size)
  * passed an extra argument for the caller return address, which will be
  * ignored.
  */
-JEMALLOC_EXPORT void (* const __free_hook)(void *ptr) = je_free;
-JEMALLOC_EXPORT void *(* const __malloc_hook)(size_t size) = je_malloc;
-JEMALLOC_EXPORT void *(* const __realloc_hook)(void *ptr, size_t size) =
-    je_realloc;
-JEMALLOC_EXPORT void *(* const __memalign_hook)(size_t alignment, size_t size) =
+JEMALLOC_EXPORT void (* __free_hook)(void *ptr) = je_free;
+JEMALLOC_EXPORT void *(* __malloc_hook)(size_t size) = je_malloc;
+JEMALLOC_EXPORT void *(* __realloc_hook)(void *ptr, size_t size) = je_realloc;
+JEMALLOC_EXPORT void *(* __memalign_hook)(size_t alignment, size_t size) =
     je_memalign;
 #endif