gnu: Add texlive-imakeidx.

* gnu/packages/tex.scm (texlive-imakeidx): New variable.

gnu: Add texlive-yazd-thesis.

* gnu/packages/tex.scm (texlive-yazd-thesis): New variable.

gnu: Add texlive-xmuthesis.

* gnu/packages/tex.scm (texlive-xmuthesis): New variable.

gnu: Add texlive-xduts.

* gnu/packages/tex.scm (texlive-xduts): New variable.

gnu: Add texlive-xduthesis.

* gnu/packages/tex.scm (texlive-xduthesis): New variable.

gnu: Add texlive-wsemclassic.

* gnu/packages/tex.scm (texlive-wsemclassic): New variable.

gnu: Add texlive-vancouver.

* gnu/packages/tex.scm (texlive-vancouver): New variable.

gnu: Add texlive-uwthesis.

* gnu/packages/tex.scm (texlive-uwthesis): New variable.

gnu: Add texlive-uwa-pif.

* gnu/packages/tex.scm (texlive-uwa-pif): New variable.

gnu: Add texlive-uwa-pcf.

* gnu/packages/tex.scm (texlive-uwa-pcf): New variable.

gnu: Add texlive-uwa-letterhead.

* gnu/packages/tex.scm (texlive-uwa-letterhead): New variable.

gnu: Add texlive-uwa-colours.

* gnu/packages/tex.scm (texlive-uwa-colours): New variable.

gnu: Add texlive-uvaletter.

* gnu/packages/tex.scm (texlive-uvaletter): New variable.

gnu: Add texlive-utexasthesis.

* gnu/packages/tex.scm (texlive-utexasthesis): New variable.

gnu: Add texlive-ut-thesis.

* gnu/packages/tex.scm (texlive-ut-thesis): New variable.

gnu: Add texlive-uspatent.

* gnu/packages/tex.scm (texlive-uspatent): New variable.

gnu: Add texlive-urcls.

* gnu/packages/tex.scm (texlive-urcls): New variable.

gnu: Add texlive-uowthesistitlepage.

* gnu/packages/tex.scm (texlive-uowthesistitlepage): New variable.

gnu: Add texlive-uowthesis.

* gnu/packages/tex.scm (texlive-uowthesis): New variable.

gnu: Add texlive-uothesis.

* gnu/packages/tex.scm (texlive-uothesis): New variable.