build: omit -gline-tables-only for --enable-asan

`-gline-tables-only` is a clang-only flag.  Drop it, it's not needed for
address sanitizer-enabled builds and it makes it impossible to build
with gcc.

Fixes: https://github.com/nodejs/node/issues/3656
PR-URL: https://github.com/nodejs/node/pull/3680


Reviewed-By: Fedor Indutny <fedor@indutny.com>