master: generate-version.sh: don't assume .git/ layout

The branch "master" has been updated in SBCL:
       via  f39348923980ca6ca006bef3e5cca23a5bb04978 (commit)
      from  3a7a5218d4f926e211178ed25eb790f5ada88d61 (commit)

- Log -----------------------------------------------------------------
commit f39348923980ca6ca006bef3e5cca23a5bb04978
Author: Luís Borges de Oliveira <[email protected]>
Date:   Fri May 15 15:47:09 2026 +0100

    generate-version.sh: don't assume .git/ layout
    
    Use git symbolic-ref instead of poking directly at the .git directory.
    This way we can handle git worktrees where .git is not a directory.
---
 generate-version.sh | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/generate-version.sh b/generate-version.sh
index 9e00aecd0..c7a8f181d 100755
--- a/generate-version.sh
+++ b/generate-version.sh
@@ -38,13 +38,7 @@ EOF
 fi
 # Build it.
 version_head=`git rev-parse HEAD`
-if grep -q "ref: refs/heads/.*" .git/HEAD > /dev/null 2>&1
-then
-    version_branchname=`cut -d / -f 3- < .git/HEAD`
-else
-    # Detached head.
-    version_branchname="HEAD"
-fi
+version_branchname=`git symbolic-ref --short -q HEAD || echo HEAD`
 if [ -z "$SBCL_BUILDING_RELEASE_FROM" ]
 then
     version_root=`git merge-base HEAD origin/master`

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