dc-chain: Adapt to system where the GNU make executable isn't called 'make' (but 'gmake' for example).
	  Add '--disable-werror' to gdb and insight configure arguments.
Don't hardcode bash location.
Use /bin/sh instead of bash
Fixed Open GL examples
make_banner.sh requires bash.

/bin/sh does not support the -n flag to echo on some OSes. We need bash to ensure it works properly.

Revert "Use /bin/sh instead of bash"

This reverts commit 8910881aa1100fe022c3c5e25c10ec7a4344afee.