message: use _docdir macro in rpm spec
diff: @@ -42,21 +42,21 @@ rm -rf $RPM_BUILD_ROOT
  %files
  %defattr(-,root,root,0755)
  %doc LICENSE doc/LINUX_HOWTO.txt
  -/usr/share/doc/pcm
  +%{_docdir}/pcm
  +%{_docdir}/pcm/CUSTOM-COMPILE-OPTIONS.md
  +%{_docdir}/pcm/DOCKER_README.md
  +%{_docdir}/pcm/ENVVAR_README.md
  +%{_docdir}/pcm/FAQ.md
  +%{_docdir}/pcm/FREEBSD_HOWTO.txt
  +%{_docdir}/pcm/LINUX_HOWTO.txt
  +%{_docdir}/pcm/MAC_HOWTO.txt
  +%{_docdir}/pcm/PCM-EXPORTER.md
  +%{_docdir}/pcm/PCM-SENSOR-SERVER-README.md
  +%{_docdir}/pcm/PCM_RAW_README.md
  +%{_docdir}/pcm/README.md
  +%{_docdir}/pcm/WINDOWS_HOWTO.md
  +%{_docdir}/pcm/license.txt
  /usr/share/licenses/pcm
  -/usr/share/doc/pcm/CUSTOM-COMPILE-OPTIONS.md
  -/usr/share/doc/pcm/DOCKER_README.md
  -/usr/share/doc/pcm/ENVVAR_README.md
  -/usr/share/doc/pcm/FAQ.md
  -/usr/share/doc/pcm/FREEBSD_HOWTO.txt
  -/usr/share/doc/pcm/LINUX_HOWTO.txt
  -/usr/share/doc/pcm/MAC_HOWTO.txt
  -/usr/share/doc/pcm/PCM-EXPORTER.md
  -/usr/share/doc/pcm/PCM-SENSOR-SERVER-README.md
  -/usr/share/doc/pcm/PCM_RAW_README.md
  -/usr/share/doc/pcm/README.md
  -/usr/share/doc/pcm/WINDOWS_HOWTO.md
  -/usr/share/doc/pcm/license.txt
  /usr/share/licenses/pcm/LICENSE
  %{_sbindir}/pcm-core
  %{_sbindir}/pcm-iio
  