Export je_memalign and je_valloc

da99e31 removed attributes on je_memalign and je_valloc, while they didn't
have a definition in the jemalloc.h header, thus making them non-exported.
Export them again, by defining them in the jemalloc.h header.

include/jemalloc/jemalloc.h.in

@@ -50,6 +50,15 @@ JEMALLOC_EXPORT void	*je_aligned_alloc(size_t alignment, size_t size)
 JEMALLOC_EXPORT void	*je_realloc(void *ptr, size_t size);
 JEMALLOC_EXPORT void	je_free(void *ptr);
 
+#ifdef JEMALLOC_OVERRIDE_MEMALIGN
+JEMALLOC_EXPORT void *	je_memalign(size_t alignment, size_t size)
+    JEMALLOC_ATTR(malloc);
+#endif
+
+#ifdef JEMALLOC_OVERRIDE_VALLOC
+JEMALLOC_EXPORT void *	je_valloc(size_t size) JEMALLOC_ATTR(malloc);
+#endif
+
 JEMALLOC_EXPORT size_t	je_malloc_usable_size(const void *ptr);
 JEMALLOC_EXPORT void	je_malloc_stats_print(void (*write_cb)(void *,
     const char *), void *je_cbopaque, const char *opts);