gnu: Simplify simple-texlive-package for non-trivial packages.

* gnu/packages/tex.scm (simple-texlive-package): When #:TRIVIAL keyword is not
set, do not add any phase, and let TRIVIAL-BUILD-SYSTEM proceed.  With this
change, `simple-texlive-package' can be removed piece-wise in texlive packages
without breakage, assuming spurious `chdir' and `copy-files' phases are
removed.
(texlive-bidi):
(texlive-alphalph):
(texlive-mflogo):
(texlive-amsfonts):
(texlive-halloweenmath):
(texlive-atveryend):
(texlive-auxhook):
(texlive-epstopdf-pkg):
(texlive-filecontents):
(texlive-graphics):
(texlive-hycolor):
(texlive-xcolor):
(texlive-hyperref):
(texlive-oberdiek):
(texlive-rerunfilecheck):
(texlive-onedown):
(texlive-tools):
(texlive-fontspec):
(texlive-stringenc):
(texlive-amsmath):
(texlive-mathdots):
(texlive-amscls):
(texlive-babel):
(texlive-babel-french):
(texlive-babel-swedish):
(texlive-pict2e):
(texlive-psnfss):
(texlive-bigfoot):
(texlive-firstaid):
(texlive-pdftexcmds):
(texlive-refcount):
(texlive-capt-of):
(texlive-makecmds):
(texlive-metalogo):
(texlive-paralist):
(texlive-polyglossia):
(texlive-fancyhdr):
(texlive-letltxmacro):
(texlive-listings):
(texlive-kvoptions):
(texlive-zref):
(texlive-eso-pic):
(texlive-pdfpages):
(texlive-stmaryrd):
(texlive-subfigure):
(texlive-lh):
(texlive-acronym):
(texlive-ms):
(texlive-ncctools):
(texlive-numprint):
(texlive-atbegshi):
(texlive-bigintcalc):
(texlive-bitset):
(texlive-etexcmds):
(texlive-gettitlestring):
(texlive-infwarerr):
(texlive-intcalc):
(texlive-kvdefinekeys):
(texlive-kvsetkeys):
(texlive-ltxcmds):
(texlive-pdfescape):
(texlive-uniquecounter):
(texlive-pdfx):
(texlive-marginnote):
(texlive-tabu):
(texlive-siunitx):
(texlive-sectsty):
(texlive-morefloats):
(texlive-ifmtarg):
(texlive-pagenote):
(texlive-titling):
(texlive-ifoddpage):
(texlive-storebox):
(texlive-collectbox):
(texlive-grfext):
(texlive-adjustbox):
(texlive-qrcode):
(texlive-unicode-math):
(texlive-babel-czech):
(texlive-babel-dutch):
(texlive-babel-finnish):
(texlive-babel-danish):
(texlive-babel-polish):
(texlive-abstract):
(texlive-breqn):
(texlive-datatool):
(texlive-lastpage):
(texlive-soul):
(texlive-soulutf8):
(texlive-totcount):
(texlive-totpages): Remove `chdir' and `copy-files' phases.

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