gendef: Remove printing __DATE__, to improve build reproducibility

This tool isn't evolving particularly much at the moment, so the
additional value of knowing when a particular version was built
doesn't give much extra value.

Normally, a stripped build of gendef (on Linux) produces a binary
with the exact same hash each time. Using __DATE__ breaks that
reproducibility, if rebuilt on different days. It is possible to
avoid the issue by setting SOURCE_DATE_EPOCH to a fixed value when
building, but in this case, I think the printed date doesn't add much
value, so we could simply remove it. Most other similar tools don't
contain such printouts.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-tools/gendef/src/gendef.c

diff --git a/mingw-w64-tools/gendef/src/gendef.c b/mingw-w64-tools/gendef/src/gendef.c
index 4aa9a42..92ba506 100644
--- a/mingw-w64-tools/gendef/src/gendef.c
+++ b/mingw-w64-tools/gendef/src/gendef.c
@@ -196,7 +196,6 @@
                    "  By default, the output files are named after their DLL counterparts\n"
                    "  gendef MYDLL.DLL     Produces MYDLL.def\n"
                    "  gendef - MYDLL.DLL   Prints the exports to stdout\n");
-  fprintf (stderr, "\nBuilt on %s\n", __DATE__);
   fprintf (stderr, "\nReport bugs to <mingw-w64-public@lists.sourceforge.net>\n");
   exit (0);
 }