ChangeLog.d/nonversioned-library-soname.txt

Features
   * make: enable building unversioned shared library, with e.g.:
     "SHARED=1 SOEXT_TLS=so SOEXT_X509=so SOEXT_CRYPTO=so make lib"
     resulting in library names like "libmbedtls.so" rather than
     "libmbedcrypto.so.11".