otatools: added missing shared library for make_ext4fs

Added the missing shared library libpcre2.so for make_ext4fs
in the otatools.zip.
Standalone signing the images with otatools zip is not working
due to missing library for make_ext4fs.

Test: tools/releasetools/sign_target_files_apks
    -p <extracted ota-tools.zip folder>
    --extra_signapk_args=-f /etc/opt/cert_data.dat
    -v
    --replace_verity_private_key ~/build/target/product/security/verity
    --replace_verity_public_key ~/build/target/product/security/verity.x509.pem
    -k <key maping>
    <input target files zip>
    <output target files zip>

Change-Id: I4fc71a1c710f3075bb3bdb90d915538526004ee6