Closes Homebrew/homebrew#27619.

Supports configure scripts (e.g., mplayer) that use "gcc -v" to
identify compiler.

Closes Homebrew/homebrew#27793.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Fixes Homebrew/homebrew#27842.

Fixes Homebrew/homebrew#27836.

Otherwise super will overwrite @env_proc with the default value.

The method signature of Dependency changed in
1fdf69b90382c43493a5f62f0020729289db6c70, however LD64Dependency was
missed in the update. This resulted in failures in merge_repeats(),
which creates many dependency objects using all three arguments.

  require "time"
  Time.parse(Time.now.to_s)

This roughly matches the logic we use to determine the active keg in
ARGV.kegs.

Avoids errors with `brew versions` when bottling.

References Homebrew/homebrew#27615.

Closes Homebrew/homebrew#27759.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#27716.

Closes Homebrew/homebrew#27255.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Conflicts:
	Library/Homebrew/cmd/audit.rb

Fixes Homebrew/homebrew#27702.
Fixes Homebrew/homebrew#27704.

Fixes Homebrew/homebrew#27685.

We know what strategy we want, so going through DownloadStrategyDetector
is wasted work. Now we can remove those patterns from the detector and
have two fewer branches each time through.

Closes Homebrew/homebrew#27672.

This already happens in the superclass.

Fixes Homebrew/homebrew#27671.

The system certs are too old to be able to read from Github, so
don't try to use the Github API on 1.8.6 either.