Bug 1420092 - Don't reject --enable-jemalloc on platforms where it's not the default. r=njn

The first step of making --enable-jemalloc the default everywhere is to
at least allow to build with it everywhere. Which currently probably
fails on a few platforms, but they're not going to be fixed if they're
explicitly rejected at configure time.

--HG--
extra : rebase_source : f29383e2d73986f3e5b033ac82c0d520bacd4fa6

build/moz.configure/memory.configure

@@ -25,10 +25,6 @@ def jemalloc(value, target, c_compiler):
     if target.kernel == 'WINNT' and c_compiler.type in ('msvc', 'clang-cl'):
         return True
 
-    if value and target.kernel not in ('WINNT', 'Linux', 'Darwin', 'kFreeBSD',
-                                       'FreeBSD', 'NetBSD'):
-        die('--enable-jemalloc is not supported on %s', target.kernel)
-
 
 set_config('MOZ_MEMORY', jemalloc)
 set_define('MOZ_MEMORY', jemalloc)