commit f7c796b75df5de91dcc5db10ccf8b2db65bbfbc6
Author: Isaac Dunham <ibid.ag@gmail.com>
Date:   Thu Aug 7 22:24:36 2014 -0700

    issetugid is supported here

diff --git a/libbase/jemalloc.c b/libbase/jemalloc.c
index 9321f59..cdd540f 100644
--- a/libbase/jemalloc.c
+++ b/libbase/jemalloc.c
@@ -190,7 +190,6 @@
 
 #if defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID)
 #define	_GNU_SOURCE /* For mremap(2). */
-#define	issetugid() 0
 #if 0 /* Enable in order to test decommit code on Linux. */
 #  define MALLOC_DECOMMIT
 #endif
@@ -240,7 +239,6 @@ static unsigned long tlsIndex = 0xffffffff;
 #else
 #define	_pthread_self() __threadid()
 #endif
-#define	issetugid() 0
 
 #ifndef MOZ_MEMORY_WINCE
 /* use MSVC intrinsics */