Bug#876596: libcanberra FTBFS with gtk-doc-tools 1.26: gtkdoc-mktmpl is no longer available

[Adrian Bunk]

Source: libcanberra
Version: 0.30-3
Severity: serious
Tags: buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libcanberra.html

...
Making all in gtkdoc
make[3]: Entering directory '/build/1st/libcanberra-0.30/gtkdoc'
  DOC   Scanning header files
  DOC   Rebuilding template files
/bin/bash: gtkdoc-mktmpl: command not found
Makefile:688: recipe for target 'tmpl-build.stamp' failed
make[3]: *** [tmpl-build.stamp] Error 127