Revert "chore, lose the conditional for glep2 building again"

gcc 4.9 is ready, older versions aren't.

This reverts commit 5f719cdb455b1f4eacd90e9afa2299a1dc27ff4d.
Merge branch 'tool/glep'

* tool/glep:
  Revert "chore, lose the conditional for glep2 building again"