Bug#908009: sketch: missing build dependency on xsltproc

[Adrian Bunk]

Source: sketch
Version: 1:0.3.7-7
Severity: serious
Tags: ftbfs

https://buildd.debian.org/status/package.php?p=sketch&suite=sid

...
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
xsltproc --nonet -o sketch.1 /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl  debian/sketch-man.xml
make[1]: xsltproc: Command not found
make[1]: *** [debian/rules:28: override_dh_auto_build] Error 127