Update build script to remove copying libnssdbm3.so around
Since https://bugzilla.mozilla.org/show_bug.cgi?id=1594933 landed there is no libnssdbm3.so
file built anymore by default.
Since https://bugzilla.mozilla.org/show_bug.cgi?id=1594933 landed there is no libnssdbm3.so
file built anymore by default.