Add libnl support and update prerequisites in build scripts

- Enhanced build-libraries.sh to configure and build libnl version 3.2.0, including checks for required tools like flex and bison.
- Updated download_prerequisites.sh to include the download link for libnl.
- Modified README.md to document the addition of libnl and its dependencies.
- Set LIBNL_VER to 3.2.0 in versions.sh for consistency across scripts.

build-libraries.sh

@@ -89,6 +89,30 @@ make install
 
 # ==================================================================
 
+cd "${LIB_BUILD_DIR}/libnl-${LIBNL_VER}"
+if ! command -v flex >/dev/null 2>&1; then
+    echo "Ошибка: для сборки libnl нужен flex (пакет flex)."
+    exit 1
+fi
+if ! command -v bison >/dev/null 2>&1; then
+    echo "Ошибка: для сборки libnl нужен bison (byacc не подходит)."
+    exit 1
+fi
+export YACC="bison -y"
+export LEX="flex"
+./configure \
+    --host="${TARGET}" \
+    --prefix="${SYSROOT_USR_DIR}" \
+    --libdir="${SYSROOT_USR_DIR}/lib" \
+    --disable-shared \
+    --enable-static \
+    --disable-cli
+make -j$(nproc)
+make install
+unset YACC LEX
+
+# ==================================================================
+
 OPENSSL_S_SERVER_FILE="${LIB_BUILD_DIR}/openssl-${OPENSSL_VER}/apps/s_server.c"
 if [ -f "${OPENSSL_S_SERVER_FILE}" ] && ! grep -q '^#include <sys/stat.h>$' "${OPENSSL_S_SERVER_FILE}"; then
     echo "== Патч OpenSSL: добавляю <sys/stat.h> в apps/s_server.c =="