[bug#71208] [PATCH core-updates] gnu: po4a: Update to 0.72.

[gemmaro]

It might be better to wait for the next po4a release.

I haven't found any problems for use in Guix itself.  This means that
"make" and "make as-derivation" complete successfully.  However, some
problems have been reported with Debian packages [1].  So there may also
be problems with the Guix packages as well.

Therefore, I'm going to send revision 2 of the patch when the next
release of po4a is available.

Best,

[1] 
https://lists.po4a.org/archives/list/devel@lists.po4a.org/thread/VQUJAYNZ2UUVHFZWCQHLITCXQNTMKOLW/