0.5.33:

This patch release provides several bug fixes and improvements, as well as
added support for the NO_COLOR environment variable.

- driver: always respect the NO_COLOR envvar & SLBT_DRIVER_ANNOTATE_NEVER flag.
- driver: a heuristics-based -disable-shared now overrides --tag=disable-static.
- driver: --tag=disable-shared now overrides a heuristics-based -disable-static.
- link mode: always include deplib dirs in ldpathenv.
- link mode: enclose vnames in wrapper script in braces.
- link mode: always include explicit -L dirs in ldpathenv.
- link mode: shared: use .deps of a static-only .la input argument as needed.
- link mode: require dependency list to be present for all .la input arguments.
- execute mode: fix NULL ptr deref with only one argument.
- execute mode: handle relative -L pathnames & cwd-relative wrapper scripts.
- install mode: slbt_exec_install(): added legacy shtool support.
- install mode: account for a libfoo.a that was created with -disable-static.
- install mode: always respect the SLBT_DRIVER_ANNOTATE_NEVER flag.
- uninstall mode: always respect the SLBT_DRIVER_ANNOTATE_NEVER flag.
- argv.h: tty colors: added argv_usage_plain().
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