Concise JEMALLOC_HAVE_ISSETUGID case in secure_getenv().
Concise JEMALLOC_HAVE_ISSETUGID case in secure_getenv().

Bug: 21326736
(cherry picked from commit ee5d34b19595363f73181632a8d9bc40a2bd1eac)

Change-Id: I740679598ad8855b9a2374ef6397c7c8717c04d8

geekboxzone/mmallow_external_jemalloc,geekboxzone/mmallow_external_jemalloc,AndroidExternal/jemalloc,geekboxzone/mmallow_external_jemalloc,AndroidExternal/jemalloc,geekboxzone/mmallow_external_jemalloc,AndroidExternal/jemalloc,AndroidExternal/jemalloc