mingit: exclude the tzdata

Since msys2/MINGW-packages#24750, the
`mingw-w64-gcc-libs` package now has a hard dependency on
`mingw-w64-tzdata`. That latter package contains, let's say, _many_
files.

As a consequence, the `7z` invocation to build MinGit would now fail
like this:

  Creating .zip archive
  + cd /
  + 7z a -mx9 [...]
  release.sh: line 176: /mingw64/bin/7z: Argument list too long
  Error: Process completed with exit code 126.

Since the new code that makes use of that tzdata explicitly comes with a
fall-back to an internal database, let's just skip the tzdata when
building MinGit.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

make-file-list.sh

@@ -50,7 +50,7 @@ then
 	PACKAGE_EXCLUDES="$PACKAGE_EXCLUDES mingw-w64-bzip2 mingw-w64-c-ares
 		mingw-w64-libsystre mingw-w64-libtre-git mingw-w64-p11-kit
 		mingw-w64-tcl mingw-w64-tk mingw-w64-wineditline gdbm icu libdb
-		libedit libgdbm perl perl-.*"
+		libedit libgdbm perl perl-.* mingw-w64-tzdata"
 fi
 if test -z "$INCLUDE_GIT_UPDATE"
 then