Split make.sh build, fix lints, cleanup

[prasannavl]

/kind refactor

• Split make.sh build into deps, conf and make, so it's easier to split these for other tasks analyzers, lints, etc.
• Simplify extra vars for make, conf and deps:
  • EXTRA_MAKE_ARGS => MAKE_ARGS
  • EXTRA_MAKE_CONF_ARGS => MAKE_CONF_ARGS
  • EXTRA_MAKE_DEPENDS_ARGS => MAKE_DEPS_ARGS
• Introduce MAKE_JOBS var to target all parallel jobs at once.
• Introduce MAKE_DEBUG var as convenience to get debug builds (suffixes MAKE_CONF_ARGS with --enable-debug)
• Introduce MAKE_COMPILER that prepends the compiler flags to MAKE_CONF_ARGS, defaults to clang.
• Cleanup redundant QT left over args
• Fix existing shell lints, primarily quotes related.
• Mild refactor to pkg_install commands (that's only for convenience use - never used directly at the time of this), specifically to cleanup sudo, so it can be used in limited container env which disallow sudo)
• Add HOST to depends so target is carried forward to keep it platform agnostic (even though we don't really use this anywhere else)

[ShengguangXiao]

So this change will use GCC as the default compiler again? Should we check the minimum GCC version?

[bvbfan]

GCC version should be 10.3 or Clang due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68070

[prasannavl]

More PRs coming soon. Base updates that push the gcc up, and have better consistency to use the same compilers for CI tests and builds.

This change doesn't affect the CI builds though. The docker images still use clang. It only affects local builds.

[prasannavl]

• Added MAKE_COMPILER flags that prepends the compiler flags to MAKE_CONF_ARGS, which defaults to clang. Should now retain the same behavior, but in a cleaner way and configurable way.