Complete MIPS atomic support on pre-MIPS32 architectures

Extend the support for pre-MIPS32 architectures (done mostly in
60b6b28c213a420ee40e254ff1823876098e0a04) also to orderedMemoryFence.

Change-Id: I50b9091c16166b8434a07988053c1f901d528237
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Enable ELF .interp section on Hurd

The toolchain is basically the same as on Linux, so we can get the
program interpreter and print the build information when Qt5Core.so
is run.

Change-Id: I02a910e691622e24e882015716c5f74dd5a20c4a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>