gnu: Remove all #:select from (gnu packages ...) modules.

This works around Guile bug <http://bugs.gnu.org/15540>.
Reported by Andreas Enge <andreas@enge.fr>.

* gnu/packages/engineering.scm: Don't #:select from (gnu packages ...).
* gnu/packages/gcc.scm: Likewise.
* gnu/packages/package-management.scm: Likewise.
* gnu/packages/photo.scm: Likewise.
* gnu/packages/pulseaudio.scm: Likewise.
* gnu/packages/moe.scm: Likewise, and #:select from (guix licenses)
  instead.