bug#37089: texlive-union includes log files with timestamps

[Maxim Cournoyer]

Here's an actual example of the problem:

diffoscope --exclude-command stat 
/gnu/store/igc79crx5ya5vwyzkd2l95nlpbk647in-texlive-union-49435{,-check}
--- /gnu/store/igc79crx5ya5vwyzkd2l95nlpbk647in-texlive-union-49435
+++ /gnu/store/igc79crx5ya5vwyzkd2l95nlpbk647in-texlive-union-49435-check
├── share
│ ├── texmf-var
│ │ ├── web2c
│ │ │ ├── updmap.log
│ │ │ │ @@ -1,9 +1,9 @@
│ │ │ │  updmap version r44331 (2017-05-14 02:15:43 +0000)
│ │ │ │ -Wed Sep 11 01:17:36 2019
│ │ │ │ +Wed Sep 11 01:17:33 2019
│ │ │ │  
│ │ │ │  Using the following config files:
│ │ │ │  
│ │ │ │  updmap is creating new map files
│ │ │ │  using the following configuration:
│ │ │ │    LW35 font names                  : URWkb (default)
│ │ │ │    prefer outlines                  : true (default)
│ │ │ │ @@ -795,26 +795,26 @@
│ │ │ │  tmro108r
│ │ │ │  tmui108r
│ │ │ │  zd
│ │ │ │  zpzdr-reversed
│ │ │ │  
│ │ │ │  Files generated:
│ │ │ │    
/gnu/store/igc79crx5ya5vwyzkd2l95nlpbk647in-texlive-union-49435/share/texmf-var/fonts/map/dvips/updmap:
│ │ │ │ -       15888 2019-09-11 01:17:36 builtin35.map
│ │ │ │ -       21361 2019-09-11 01:17:36 download35.map
│ │ │ │ -       21361 2019-09-11 01:17:36 psfonts_pk.map
│ │ │ │ -       21361 2019-09-11 01:17:36 psfonts_t1.map
│ │ │ │ -       21356 2019-09-11 01:17:36 ps2pk.map
│ │ │ │ -          14 2019-09-11 01:17:36 psfonts.map -> psfonts_t1.map
│ │ │ │ +       15888 2019-09-11 01:17:33 builtin35.map
│ │ │ │ +       21361 2019-09-11 01:17:33 download35.map
│ │ │ │ +       21361 2019-09-11 01:17:33 psfonts_pk.map
│ │ │ │ +       21361 2019-09-11 01:17:33 psfonts_t1.map
│ │ │ │ +       21356 2019-09-11 01:17:33 ps2pk.map
│ │ │ │ +          14 2019-09-11 01:17:33 psfonts.map -> psfonts_t1.map
│ │ │ │    
/gnu/store/igc79crx5ya5vwyzkd2l95nlpbk647in-texlive-union-49435/share/texmf-var/fonts/map/pdftex/updmap:
│ │ │ │ -       21363 2019-09-11 01:17:36 pdftex_dl14.map
│ │ │ │ -       19698 2019-09-11 01:17:36 pdftex_ndl14.map
│ │ │ │ -          15 2019-09-11 01:17:36 pdftex.map -> pdftex_dl14.map
│ │ │ │ +       21363 2019-09-11 01:17:33 pdftex_dl14.map
│ │ │ │ +       19698 2019-09-11 01:17:33 pdftex_ndl14.map
│ │ │ │ +          15 2019-09-11 01:17:33 pdftex.map -> pdftex_dl14.map
│ │ │ │    
/gnu/store/igc79crx5ya5vwyzkd2l95nlpbk647in-texlive-union-49435/share/texmf-var/fonts/map/dvipdfmx/updmap:
│ │ │ │ -         411 2019-09-11 01:17:36 kanjix.map
│ │ │ │ +         411 2019-09-11 01:17:33 kanjix.map
│ │ │ │  
│ │ │ │  WARNING: updmap has found mismatched files!
│ │ │ │  
│ │ │ │  The following files have been generated as listed above,
│ │ │ │  but will not be found because overriding files exist, listed below.
│ │ │ │   builtin35.map: 
│ │ │ │   download35.map: