Revert "qibuild: allow storing cmake flags in toc config"
Revert "qibuild: allow storing cmake flags in toc config"

This reverts commit 3e41af4f9d22392a0e6f6be35929ac11a0e4a584.

This is not necessary if you allow user to write its cmake
flags in .qi/<config>.cmake

Let's remove this useless feature

aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild