Note fixed build in UPDATES
Fix startup crash when libcrypto symbols are missing
Also detect missing symbols in libssl and libtcl
Show missing symbol errors in stderr on startup
Remove MAKEJOBS as it breaks job control
Regen after removing std_arg.h
Add CXX_FLAG_CHECK to detect compiler support for various flags
Only enable -fstack-protector if compiler supports it
Switch to using CXX_FLAG_CHECK for -fcolor-diagnostics [clang]