Vendored xerces-c call segfault on Linux

[jasercion]

Built binaries on Linux machines segfault when gtsrcmaps or gtlike are called if not run on the machine they are built on. Stacktrace indicates that this is cause by a fault thrown during XML handling, specifically within the mutex lock handling of xerces-c. Operating theory is that this is similar to the gtltcubesun segfault issue, in that it may be that a destructor associated with the xml objects isn't being called/executed properly leading to an access issue and the subsequent failure by segmentation fault.

This only occurs on linux machines and does not occur when using the conda-forge provided binaries for linux architectures or if the tools are being run on a machine they were locally compiled on.

Issue can be replicated with build 2.4.90 when running either gtsrcmaps or gtlike on S3DF or any similar linux system.

[jasercion]

Deferring until after the next release. In the meantime, use of the conda-forge provided xerces-c has been implemented specifically for linux builds.