glib build fix with libiconv

[th0ma7]

Description

MPD update+build fix and glib + libiconv fix

Relates to #6040

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package functionality was tested
• Any needed documentation is updated/created

Type of change

• Bug fix
• New Package
• Package update
• Includes small framework changes
• This change requires a documentation update (e.g. Wiki)

[hgy59]

@th0ma7 I have #5652 in progress.

It already builds for DSM 7+ only.
Is there anything missing in #5652 beside the update from 0.23.12 to 0.23.15?

[th0ma7]

I wasn't intending to update mpd at first but focus was to solve glib use case. It turned out that mpd needed attention to get it all to build properly.

Anyhow, I can certainly remove the mpd portion of this PR. My focus is to fix glib for #6040 to limiting massive rebuild time. Are you ok with me merging only the glib bits then?

[hgy59]

Anyhow, I can certainly remove the mpd portion of this PR. My focus is to fix glib for #6040 to limiting massive rebuild time. Are you ok with me merging only the glib bits then?

Yes that's ok. I will wait with #5652 until you merged the glib bits...

[th0ma7]

Yes that's ok. I will wait with #5652 until you merged the glib bits...

@hgy59 done!

[hgy59]

@th0ma7 why does the build of mpd (without update) fail?

[th0ma7]

So in one case you get glib failing due to libiconv (issue that is resolved with newer glib). In turn, on the faulty glib, when fixing build by enforcing external libiconv it ends up making mpd to fail as well. Again fixed with newer mpd.