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.

download_prerequisites.sh

@@ -42,6 +42,7 @@ toolchain_files=(
 
 # Исходники библиотек
 libs_files=(
+    "https://www.infradead.org/~tgr/libnl/files/libnl-${LIBNL_VER}.tar.gz"
     "https://download.savannah.gnu.org/releases/freetype/freetype-${FREETYPE_VER}.tar.gz"
     "https://github.com/LibVNC/libvncserver/archive/LibVNCServer-${LIBVNCSERVER_VER}.tar.gz"
     "https://www.openssl.org/source/openssl-${OPENSSL_VER}.tar.gz"