Add missing header includes in jemalloc/jemalloc.h .

Add stdlib.h, stdbool.h, and stdint.h to jemalloc/jemalloc.h so that
applications only have to #include <jemalloc/jemalloc.h>.

This resolves jemalloc#132.

Author: jasone

doc/jemalloc.xml.in

@@ -57,8 +57,7 @@
   <refsynopsisdiv>
     <title>SYNOPSIS</title>
     <funcsynopsis>
-      <funcsynopsisinfo>#include &lt;<filename class="headerfile">stdlib.h</filename>&gt;
-#include &lt;<filename class="headerfile">jemalloc/jemalloc.h</filename>&gt;</funcsynopsisinfo>
+      <funcsynopsisinfo>#include &lt;<filename class="headerfile">jemalloc/jemalloc.h</filename>&gt;</funcsynopsisinfo>
       <refsect2>
         <title>Standard API</title>
         <funcprototype>

include/jemalloc/jemalloc_macros.h.in

@@ -1,3 +1,6 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
 #include <limits.h>
 #include <strings.h>