Add 32-bit linux build target for Travis

[thrasher-]

Description

Adds a 32 bit build job for Travis to ensure that our codebase works on 32 bit systems due to finding and resolving this issue:

#388

Type of change

Please delete options that are not relevant and add an x in [] as item is complete.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Travis CI and local testing on a 32 bit system

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation and regenerated documentation via the documentation tool
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally and on Travis with my changes
• Any dependent changes have been merged and published in downstream modules

[shazbert]

utACK

[gloriousCode]

uTACK ☁️ 👾 🖲 🚈

[xtda]

utACK