Issue on Musl

[halfwit]

When running most recent pbpst, the following error occurs:
pbpst: Failed to set text domain codeset

[HalosGhost]

Initially, I thought this was due to musl-libc's different list of supported codesets than glibc's; however, preliminary testing did not confirm this. I need to make the error handling even more explicit so that we get a precise error code if possible.