gh-159440: Pass --work-tree to the git commands used for the version tag

The `GITTAG` build stamp uses `git --git-dir $(srcdir)/.git describe --all --always --dirty`. `--git-dir` does not imply a work tree, so git falls back to the current directory. In an out-of-tree build `make` runs in the build tree, where none of the tracked files exist, so the internal `diff-index HEAD` of `--dirty` reports every tracked file as deleted and the tag always comes out as `heads/<branch>-dirty` — even for a pristine checkout. In-tree builds never hit this, and `GITVERSION`/`GITBRANCH` don't touch the work tree, so only the dirty check was wrong.

Pass `--work-tree \$(srcdir)` for all three commands. The semantics of `-dirty` are preserved (a genuinely modified source tree still reports `-dirty`), and in-tree builds are unchanged because `$(srcdir)` is `.`.

Author: sendaoYan

configure

@@ -128,9 +128,9 @@ HAS_GIT=no-repository
 fi
 if test $HAS_GIT = found
 then
-    GITVERSION="git --git-dir \$(srcdir)/.git rev-parse --short HEAD"
-    GITTAG="git --git-dir \$(srcdir)/.git describe --all --always --dirty"
-    GITBRANCH="git --git-dir \$(srcdir)/.git name-rev --name-only HEAD"
+    GITVERSION="git --git-dir \$(srcdir)/.git --work-tree \$(srcdir) rev-parse --short HEAD"
+    GITTAG="git --git-dir \$(srcdir)/.git --work-tree \$(srcdir) describe --all --always --dirty"
+    GITBRANCH="git --git-dir \$(srcdir)/.git --work-tree \$(srcdir) name-rev --name-only HEAD"
 else
     GITVERSION=""
     GITTAG=""