build_scripts 2.35

What's Changed

• Remove legacy gluex_echo.sh. Only causes confusion. by @markito3 in #247
• add prereq action for halld_amp makefile by @markito3 in #248
• Revise bms osname merged by @markito3 in #251
• get the pound bang thing right by @markito3 in #252
• Go back to commit 7361d7c. by @markito3 in #253
• Change default debug level by @markito3 in #254

Full Changelog: 2.34...2.35