Windows and Linux build environments; check clean on both (E-01)

MuPDF builds with MSBuild on Windows (/MT, OpenSSL from vcpkg);
Git for Windows' MinGit stands in for the source build there. CEF
loads from where libcef lives and sets its API version first on
every platform. File identity on Windows compares volume and index.
The checkout and reference/ keep LF on Windows.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/build-mupdf.sh

@@ -9,10 +9,45 @@ jobs=$(sysctl -n hw.ncpu 2>/dev/null || nproc)
 
 # reference/ stays read-only; the copy takes the patches.
 mkdir -p "$src"
-rsync -a --delete --exclude .git "$root/reference/mupdf/" "$src/"
+case $(uname -s) in
+  MINGW* | MSYS*)
+    rm -rf "$src" && mkdir -p "$src"
+    tar -C "$root/reference/mupdf" --exclude .git -cf - . | tar -C "$src" -xf -
+    ;;
+  *) rsync -a --delete --exclude .git "$root/reference/mupdf/" "$src/" ;;
+esac
 for patch in "$root"/patches/mupdf/*.patch; do
   patch -d "$src" -p1 --forward --batch --quiet <"$patch"
 done
+case $(uname -s) in
+  MINGW* | MSYS*)
+    # MSVC: the static runtime Rust links, OpenSSL from vcpkg.
+    ssl=$(cygpath -w "$root/engines/vcpkg/installed/x64-windows-static")
+    [ -f "$ssl/lib/libcrypto.lib" ] || {
+      echo "build-mupdf.sh: no static OpenSSL; run engines/vcpkg/vcpkg install openssl:x64-windows-static" >&2
+      exit 1
+    }
+    cat >"$src/ely.props" <<PROPS
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <PreprocessorDefinitions>HAVE_LIBCRYPTO;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$ssl\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+  </ItemDefinitionGroup>
+</Project>
+PROPS
+    msbuild=$("/c/Program Files (x86)/Microsoft Visual Studio/Installer/vswhere.exe" -latest -find 'MSBuild\**\Bin\MSBuild.exe' | tr -d '\r')
+    "$msbuild" "$(cygpath -w "$src/platform/win32/mupdf.sln")" -m -nologo -v:minimal \
+      -t:libmupdf -p:Configuration=Release -p:Platform=x64 -p:PlatformToolset=v143 \
+      -p:ForceImportAfterCppTargets="$(cygpath -w "$src/ely.props")"
+    rm -rf "$out" && mkdir -p "$out"
+    cp "$src"/platform/win32/x64/Release/*.lib "$out/"
+    ls "$out"
+    exit 0
+    ;;
+esac
 flags="build=release HAVE_X11=no HAVE_GLUT=no HAVE_CURL=no HAVE_LIBCRYPTO=yes tesseract=yes"
 # make does not track flags; a change rebuilds all.
 if [ "$(cat "$out/.flags" 2>/dev/null)" != "$flags" ]; then