jemalloc: allow on MIPS64

jemalloc uses architecture #ifdefs to determine LG_QUANTUM and gives an
error when an unsupported architecture is used.
For this reason, Buildroot commit 3baf996c6a2b57ffaaa4627c1e04ff67c30e9754
introduced BR2_PACKAGE_JEMALLOC_ARCH_SUPPORTS.

In the jemalloc sources, 'mips' is checked via '__mips__' which is set both
for 32-bit as 64-bit MIPS (including MIPS64 n32).
However, the Buildroot arch selection only includes 32-bit MIPS via BR2_mips
and BR2_mipsel.

Update the arch selection to support MIPS64.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/jemalloc/Config.in

@@ -3,7 +3,7 @@ config BR2_PACKAGE_JEMALLOC_ARCH_SUPPORTS
 	default y if BR2_arm || BR2_armeb
 	default y if BR2_aarch64 || BR2_aarch64_be
 	default y if BR2_i386 || BR2_x86_64
-	default y if BR2_mips || BR2_mipsel
+	default y if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
 	default y if BR2_sparc64
 	default y if BR2_powerpc
 	default y if BR2_sh4 || BR2sh4eb || BR2_sh4a || BR2_sh4aeb