gnu: Add some missing ECL packages.
* gnu/packages/lisp-xyz.scm (ecl-cl-uglify-js, ecl-cl-sqlite, ecl-cl-webkit,
ecl-trivial-backtrace, ecl-rfc2388, ecl-cl-who, ecl-trivial-types,
ecl-cl-syntax, ecl-cl-utilities, ecl-xsubseq, ecl-smart-buffer,
ecl-trivial-cltl2, ecl-type-i, ecl-trivia.trivial, ecl-trivia, ecl-cl-str,
ecl-cl-xmlspam, ecl-serapeum, ecl-stefil, ecl-trivial-indent, ecl-type-r,
ecl-trivialib-type-unify, ecl-constantfold, ecl-postmodern, ecl-sycamore,
ecl-trivial-package-local-nicknames, ecl-mito): New variables.