Support libpathops on Linux arm.

[aebrahim]

In the file packages/vector_graphics_compiler/lib/src/_initialize_path_ops_io.dart, Linux (and Windows) are always assumed to be 64 bit. This leads to the following error when running on Linux ARM64: Could not locate libpathops at /usr/lib/flutter/bin/cache/artifacts/engine/linux-x64/libpath_ops.so

Another approach would be to leverage Abi.current()