vendor: add [package].version to vendored recipes (fix 'cannot guess version')

Converting [source] git=/tar= to path="source" removed the URL cookbook parsed
the package version from, so non-Cargo recipes without an explicit
[package].version failed at packaging ('cannot guess version', hit on
ninja-build). Add version = "0.3.1" (the branch version, matching the vendored
convention e.g. brush) to the 3 affected recipes, and make vendor-recipe.sh add
it automatically on future conversions.

local/recipes/dev/gnu-make/recipe.toml

@@ -16,4 +16,5 @@ cookbook_configure
 """
 
 [package]
+version = "0.3.1"
 description = "GNU Make build system (mkfifo jobserver enabled)"

local/recipes/dev/libtool/recipe.toml

@@ -21,4 +21,5 @@ cookbook_configure
 """
 
 [package]
+version = "0.3.1"
 description = "GNU Libtool (shared library support)"

local/recipes/dev/ninja-build/recipe.toml

@@ -13,4 +13,5 @@ template = "cmake"
 cmakeflags = ["-DBUILD_TESTING=OFF"]
 
 [package]
+version = "0.3.1"
 description = "Ninja build system"

local/scripts/vendor-recipe.sh

@@ -76,6 +76,22 @@ PY
   # stamp
   printf '%s\n' "$stamp" > "$dir/source/.redbear-src-version" 2>/dev/null || true
 
+  # Ensure [package].version exists: converting git=/tar= to path="source" removes
+  # the URL cookbook parsed the version from, so a recipe without an explicit
+  # [package].version fails packaging ("cannot guess version"). Add the branch
+  # version if missing (matches the vendored convention, e.g. brush = "0.3.1").
+  if grep -qE '^\[package\]' "$dir/recipe.toml" \
+     && ! awk '/^\[package\]/{p=1;next} /^\[/{p=0} p' "$dir/recipe.toml" | grep -qE '^[[:space:]]*version[[:space:]]*='; then
+    python3 - "$dir/recipe.toml" <<'PY'
+import re,sys
+p=sys.argv[1]; s=open(p).read()
+m=re.search(r'(\[package\][^\[]*?name\s*=\s*"[^"]*"\s*\n)', s)
+if m: s=s[:m.end()]+'version = "0.3.1"\n'+s[m.end():]
+else: s=re.sub(r'(\[package\]\s*\n)', r'\1version = "0.3.1"\n', s, count=1)
+open(p,'w').write(s)
+PY
+  fi
+
   git -C "$ROOT" add -A "$dir" "$ROOT/.gitignore" >/dev/null 2>&1
   nfiles=$(git -C "$ROOT" diff --cached --name-only -- "$dir/source" | wc -l | tr -d ' ')
   echo "[$name] vendored: $nfiles source files staged, baked $(grep -rlI '__redox__\|Q_OS_REDOX' "$dir/source" 2>/dev/null|wc -l) redox-marked"