ARM undefined symbol __aeabi_ldivmod

Created by: egrimley

After fixing a couple of trivial things, I got this build error on Debian armhf unstable, but only without DEBUG:

CMake Error at /.../dynamorio/core/CMake_readelf.cmake:94 (message):
  *** Error: /.../dynamorio-build/lib32/release/libdynamorio.so has
  undefined symbol: GLOBAL DEFAULT UND __aeabi_ldivmod