chore: vendor sglang v0.5.10 snapshot

third_party/sglang/scripts/ci/utils/install_protoc.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+# Ensure protoc is installed for router build (gRPC protobuf compilation).
+set -euxo pipefail
+
+if command -v protoc >/dev/null 2>&1 && protoc --version >/dev/null 2>&1; then
+    echo "protoc already installed: $(protoc --version)"
+    exit 0
+fi
+
+if command -v protoc >/dev/null 2>&1; then
+    echo "protoc found but not runnable, reinstalling..."
+else
+    echo "protoc not found, installing..."
+fi
+
+ARCH=$(uname -m)
+
+if command -v apt-get &> /dev/null; then
+    # Ubuntu/Debian
+    apt-get update || true # May fail due to unrelated broken packages
+    PROTOC_APT_PACKAGES=(wget unzip gcc g++ perl make)
+    apt-get install -y --no-install-recommends "${PROTOC_APT_PACKAGES[@]}" || {
+        echo "Warning: apt-get install failed, checking if required packages are available..."
+        for pkg in "${PROTOC_APT_PACKAGES[@]}"; do
+            if ! dpkg -l "$pkg" 2>/dev/null | grep -q "^ii"; then
+                echo "ERROR: Required package $pkg is not installed and apt-get failed"
+                exit 1
+            fi
+        done
+        echo "All required packages are already installed, continuing..."
+    }
+elif command -v yum &> /dev/null; then
+    # RHEL/CentOS
+    yum update -y
+    yum install -y wget unzip gcc gcc-c++ perl-core make
+else
+    echo "ERROR: Neither apt-get nor yum found; cannot install protoc build deps"
+    exit 1
+fi
+
+if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then
+    PROTOC_ARCH="aarch_64"
+else
+    PROTOC_ARCH="x86_64"
+fi
+PROTOC_ZIP="protoc-32.0-linux-${PROTOC_ARCH}.zip"
+(
+    cd /tmp
+    wget "https://github.com/protocolbuffers/protobuf/releases/download/v32.0/${PROTOC_ZIP}"
+    unzip -o "${PROTOC_ZIP}" -d /usr/local
+    rm -f "${PROTOC_ZIP}"
+)
+protoc --version