This patch makes emission of /CreationDate and /ModDate headers optional.

If the environment variable GS_GENERATE_UUIDS is set to "0" or "no", it will
not write out the "/ID" field (if that's permissible).

Upstream does not want to do this.

See: https://bugs.ghostscript.com/show_bug.cgi?id=698208
diff --git a/orig/gnu-ghostscript-9.14.0/devices/vector/gdevpdf.c b/bb/gnu-ghostscript-9.14.0/devices/vector/gdevpdf.c
index 0fb067e..b342e2c 100644
--- orig/gnu-ghostscript-9.14.0/devices/vector/gdevpdf.c
+++ gnu-ghostscript-9.14.0/devices/vector/gdevpdf.c
@@ -305,6 +305,9 @@ pdf_initialize_ids(gx_device_pdf * pdev)
      * date and time, rather than (for example) %%CreationDate from the
      * PostScript file.  We think this is wrong, but we do the same.
      */
+    if (!getenv("GS_GENERATE_UUIDS") ||
+        (strcasecmp(getenv("GS_GENERATE_UUIDS"), "0") != 0 &&
+         strcasecmp(getenv("GS_GENERATE_UUIDS"), "no") != 0))
     {
         struct tm tms;
         time_t t;
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<tr><td><span title='2018-12-16 19:58:31 +0100'>2018-12-16</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=504d9fcb8599870a7430eac693ff26615f4b7d6e'>gnu: mes: Update to 0.19.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-10-07 16:30:50 +0200'>2018-10-07</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=236fadf52868d3ced233b144f9d560b51dcecec1'>gnu: mes: Update to 0.18.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-09-11 22:34:02 +0200'>2018-09-11</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=4a67079f71c264950aa7c43c5fdaa7611298a3c4'>gnu: mes: Oops, use mirror://gnu download url.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-09-08 20:36:30 +0200'>2018-09-08</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=c665774a1ca9431746b1d559b06e24c1b05625d8'>gnu: mes: Update to 0.17.1.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-09-08 20:36:30 +0200'>2018-09-08</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=445ecce92307aa7ab70cf02b70078e860de17dc0'>gnu: nyacc: Update to 0.86.0.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-08-19 13:30:57 +0200'>2018-08-19</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=8a502c3b60fdd5d8ee0b08e1c9d4c0d7fedc2fda'>gnu: mescc-tools: Update to 0.5.2.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-08-10 08:32:11 +0200'>2018-08-10</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=256d5c6e339d59287284bb83f35c594f13bd08f9'>gnu: mes: Update to 0.17.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-07-13 19:43:38 +0200'>2018-07-13</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=00c86a888488b16ce30634d3a3a9d871ed6734a2'>gnu: mes: Update to 0.16.1.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-06-26 23:15:53 +0200'>2018-06-26</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=8127a43caba527eeb52b7f82a8904036fecea833'>gnu: mescc-tools: Update to 0.5.1.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-06-26 19:47:25 +0200'>2018-06-26</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=3466537b5313d998f44454cc513eeb5a252f21b3'>gnu: mes: Update to 0.16.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-06-26 19:47:23 +0200'>2018-06-26</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=01d77b0a394a471006c0640d2141ded774d983c8'>gnu: mescc-tools: Update to 0.5.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2018-06-12 19:21:10 +0200'>2018-06-12</span></td><td><a href='/guix/commit/gnu/packages/mes.scm?id=67cb662a31988a8e9ec3a8d7bc7541d043af6347'>gnu: mes: Update to 0.15.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>