trace-cmd: Fix build by adding docbook_xsl dependency

Gets rid of this build error:

make -C /tmp/nix-build-trace-cmd-2.5.3.drv-0/trace-cmd/Documentation all
      ASCIIDOC            trace-cmd-hist.1.xsl
*********************************
** No docbook.xsl is installed **
** Can't make man pages        **
*********************************
Makefile:59: recipe for target '/tmp/nix-build-trace-cmd-2.5.3.drv-0/trace-cmd/Documentation/trace-cmd-hist.1' failed