Enable ZSTD support properly for Android
In #28766 (moved) we tried to enable ZSTD support for Android but just specifying --enable-zstd
when compiling tor
and extracting the library is not enough:
WARNING: Unable to find libzstd, install pkg-config, and check the PKG_CONFIG_PATH environment variable, or set ZSTD_CFLAGS and ZSTD_LIBS