Implement division/remainder in hardware when using armv7s+llvm+thumb.
Hardcode the use of  CFNetwork.GetDefaultProxy for iOS so WebProxy is not required (and can be removed by the linker)
Fix build for mobile (ios and android) wrt recent pull request on System.Data
Disable a System.Core test which fails on mt because of linking.
configure.in: Remove all explicit ARM_FPU_* definitions.

We now properly detect this via the toolchain, so these
explicit definitions are now pointless.