i#1777: fix drsyms build failure on ARM
i#1777: fix drsyms build failure on ARM

Adds "-fno-exceptions" to the shared lib build of drsyms to avoid ARM build
errors with some cross-compilers on drsyms_bench.

Fixes #1777

Review-URL: https://codereview.appspot.com/267980043

AmesianX/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,code4bones/dynamorio